N58D Ground Casing Mandrel .886-1.400"

Built for Musicians

Purpose-built tools and supplies designed for accurate, efficient instrument repair.

Description

These are solid steel mandrels used to remove dents from valve casings and to straighten casings if they are sprung. Easier, faster and more safe to use than reamers and almost impossible to damage a casing using these mandrels. They are not adjustable, so you must know the size you need or the brand and model of the instrument. Precision measuring is helpful.

The recommended procedure for use:
Mount the instrument on a wood assembly mandrel in a vise.
Thoroughly clean the casings with F7 Premiere Metal Polish and Z10 Cold Cleaner
Select the proper size mandrel for the instrument and insert it all the way into the casing.
When ready to hit the mandrel, STRIKE SHARPLY. It is the quantity of hits that raises the dents and straightens casings, not the force used. Strike firmly-not hard.
Use the side of a F5 rawhide mallet and strike the small end of the mandrel with many small and repeated taps. Use sideways and up and down hits. Aim at port intersections.

ORDER THE EXACT SIZE. THESE MANDRELS ARE NOT ADJUSTABLE

Order by the O.D. of the piston. Example: Yamaha .664 Due to the differences in manufacturing over the years it is highly RECOMMENDED to measure the valve piston.

0.631	York	COR/TRPT
0.644	Imperial Creations	Pocket CORNET
0.645	Blessing	COR/TRPT
0.645	Roth, Sears	COR/TRPT
0.645	Reynolds by Blessing	COR/TRPT
0.645	Wards	COR/TRPT
0.645	Schilke	COR/TRPT
0.645	Boosey/Hawkes	COR/TRPT
0.645	Orsi	COR/TRPT
0.649	Jupiter Carol Brass	COR/TRPT
0.65	Bundy/Bach TR300	COR/TRPT
0.65	Buescher-NEW	COR/TRPT
0.65	Getzen	COR/TRPT
0.65	Getzen	VALVE T-BONE
0.65	Holton-OLD	COR/TRPT
0.65	Mercedes II, Signet	COR/TRPT
0.651	Windsor	COR/TRPT
0.657	Schenkelaars	COR/TRPT
0.658	Benge	COR/TRPT
0.66	Holton	COR/TRPT
0.66	King	COR/TRPT
0.66	King	ALTO HORN/MELL
0.66	Leblanc	COR/TRPT
0.66	Leblanc	ALTO HORN/MELL
0.66	Martin, Indiana	COR/TRPT
0.66	Reynolds by Reynolds	COR/TRPT
0.66	Shanghai	COR/TRPT
0.661	Cleveland	COR/TRPT
0.661	Selmer, French	COR/TRPT
0.664	Conn, Japanese	COR/TRPT
0.664	Bach, Mercedes I	COR/TRPT
0.664	New Collegiate	COR/TRPT
0.664	Yamaha T602R	COR/TRPT
0.664	Reynolds by Olds	COR/TRPT
0.664	Reynolds by Olds	ALTO HORN/MELL
0.664	Yamaha	COR/TRPT
0.665	Pan Am, Conn 16A	COR/TRPT
0.665	Bundy, Mercedes II, Signet	VALVE T-BONE
0.665	Olds	COR/TRPT
0.665	Olds	ALTO HORN/MELL
0.668	Couesnon	COR/TRPT
0.668	Old Collegiate	COR/TRPT
0.668	Old Holton	ALTO HORN/MELL
0.672	Huttl	COR/TRPT
0.673	Musica Austria	COR/TRPT
0.674	Czechoslovakia	COR/TRPT
0.68	Yamaha	ALTO HORN/MELL
0.682	Conn (Old)	COR/TRPT
0.682	Pan Am, Continental	COR/TRPT
0.682	Buescher-Old	COR/TRPT
0.684	Besson-Student Line	ALTO HORN/MELL
0.685	Besson-1st Line	COR/TRPT
0.686	East German	COR/TRPT
0.714	Pan Am, Continental	ALTO HORN/MELL
0.714	Pan Am, Continental	VALVE T-BONE
0.715	Martin, Indiana	ALTO HORN/MELL
0.728	Jupiter	ALTO HORN/MELL
0.728	Jupiter	VALVE T-BONE
0.737	King	VALVE T-BONE
0.738	King	MRCH. BARITONE
0.738	Olds & Reynolds by Olds	VALVE T-BONE
0.741	Bach, Mercedes I	ALTO HRN/MELL
0.772	Bundy, Mercedes II, Signet	BARITONE
0.775	Besson, Student Line	BARITONE
0.776	Besson, 1st Line	BARITONE
0.791	Getzen	BARITONE
0.791	Old Collegiate	BARITONE
0.802	Old Holton	BARITONE
0.812	Martin, Indiana	VALVE T-BONE
0.812	Martin, Indiana	BARITONE
0.828	Pan Am, Continental, Conn	BARITONE
0.832	Reynolds by Reynolds	BARITONE
0.835	King	BARITONE
0.836	Deg, Dynasty, 2 valve	BARITONE
0.837	Roth, Sears, RMC	BARITONE
0.837	Reynolds by Blessing	BARITONE
0.837	Wards	BARITONE
0.839	Reynolds by Olds	BARITONE
0.84	Bach, Mercedes I	BARI/MRCH. BARI
0.84	Bundy	BARITONE
0.842	Blessing	BARITONE
0.864	Besson-Student Line	EUPHONIUM
0.864	Boosey/Hawkes	EUPHONIUM
0.888	Conn 201 Short Action	EUPHONIUM
0.888	Pan Am, Continental	Eb BASS
0.893	Schenkelaaras	BARITONE
0.893	Schenkelaaras	TUBA
0.916	East German & Menl Weston	TUBA
0.92	Blessing Accord Bb	TUBA
0.922	Old Holton	BBb/Eb Bass
0.922	Besson-1st Line	EUPHONIUM
0.925	Yamaha	BARITONE
0.924	Getzen	BBb Bass
0.936	Cleveland	JUMBO BASS
0.939	Besson-Student Line	Eb BASS
0.947	Yamaha	Eb BASS
0.947	Yamaha-YB102	TUBA
0.975	Reynolds by Olds	BBb BASS
0.976	Besson-4 Valve	BARITONE
0.976	King and Olds	BBb BASS
0.976	Reynolds by Reynolds	BBb BASS
0.978	Besson-Student Line	BBb BASS
0.978	Bundy	TUBA
0.978	Boosey/Hawkes	BBb BASS
1.003	Jupiter	BBb BASS
1.015	Martin, Indiana	BBb BASS
1.039	Yamaha	BBb BASS
1.048	Pan Am, Continental, Conn	BBb BASS
1.062	Bundy	BBb BASS
1.062	Buescher-New	BBb BASS
1.062	Mercedes II	BBb BASS
1.062	Signet	BBb BASS
1.141	Old Holton	JUMBO BASS
1.223	Pan Am, Continental , Conn	JUMBO BASS
1.36	Besson-1st Line	BBb BASS
1.365	Besson-1st Line	Eb BASS
1.365	Besson-1st Line	JUMBO BASS

These mandrels are divided into 3 size groups:

(N58A Part # for sizes: .630-.700, N58C: .701-.885, N58D: .888-1.400)

N58A For cornet and trumpet

N58C For alto horn, valve trombone, baritone and euphonium

N58D For sousaphone, Tuba, Bari

For Sizes Not Listed or Special Sizes Please Enter Desired Size in the Note Section on the Check-out Page.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Repair Knowledge at Your Fingertips

Explore helpful instructions, sizing charts, repair guides and videos created to help you choose the right products and work more confidently at the repair bench.

Explore Repair Resources

Frequently Asked Questions

How do I choose the correct size or model?

Review the product specifications and measure your instrument or existing part when applicable. Because instrument models can vary, contact our team with the manufacturer, model and measurements if you need help confirming your selection.

Are Ferree’s Tools products for beginners?

Ferree’s Tools serves professional repair technicians, music educators and knowledgeable do-it-yourselfers. Required experience varies by product, so review all available instructions and contact us if you are unsure whether a tool is appropriate for your skill level.

What if I cannot find the exact product I need?

Contact our customer service team with details about the instrument and repair. We can help you locate the appropriate product, identify a comparable option or determine whether another solution is available.