P88 Tubing True Tool-Individual Mandrels

These “Tubing True Tool” mandrels allow the most precision and accurate way to round and straighten brass band instrument tubing, including trombone slide rail tubes. These new precision ground mandrels allow about a 3 times more precise fit than even our regular mandrels; both foreign and domestic. The new 11” length brings this proven idea into the 21st century, so that in conjunction with your N87A Trombone Pliers you will have the perfect meld of both accuracy and speed. 34 sizes available.
The N87A requires approximately 5.5” of work space for best results. The NEW P88 provides 11” for a 100% safety factor. The P88 also has incorporated a delrin “Safety Stop” to help prevent “over run”, which is used on our P53 with great success for several years. Comes with instructions.

Available:
P88L Set of 2 trombone handles (2 diameters)
P88S Set of 2 regular tube handles (2 diameters)
P88M Indv. Mandrels by size from .440” to .605” In .005 graduations/increments.
P88MS Complete mandrel set 1-34
P88P Student model set in these sizes: .480, .485, .490, .495, .500, .515, .520, .525, .530, .535
P88T Set of 10 mandrels– you choose sizes

Also, with these new mandrels being within .005" instead of .015" you will be able to do a better job than ever before because you are using rollers instead of a burnisher. The rollers roll on both sides of the tube at the same time, so there is no bending while taking the dents or damage out. With a burnisher, the action that makes a burnisher work also bends the slide mandrel, just like the older rollers that mounted in the vice. This was especially true of the rollers, mounted "truck jack" fashion, even thou made of nylon and/or aluminum, and they still bend the long mandrel. Many repairmen replace their mandrels on a regular basis for this reason. The N87A trombone pliers NEVER bend a mandrel! There is no torque applied to the mandrel.

Things we all look for. FAST, Efficient and Profitable.

Safety stops are Standard on the longer P88L trombone handles, but fit P88S also.
There are 34 sizes of mandrels from .440" to .605". They are numbered as such.
#1 thru #12 (.495") take the small handle and #13 (.500") and up take the large handle.

The long handles are for trombone work, the short ones are for tuning slide work.
You will need one mandrel for the inside slide and one for the outer slide. But, remember that many brands of trombone use the SAME SIZE bore side or inner slide size. For example: A Blessing, Besson and Bundy all use the .495", inner mandrel. But, for the outer slides, the Blessing uses the .525" the Besson a .530" and the Bundy uses the .535". Thicker stockings! (See chart below.)
Order mandrels by size. Example: For a .525" mandrel only just order a P88M-525, for instance.
#1 - .440" #10 - .485" #19 - .530" #28 - .575"
#2 - .445" #11 - .490" #20 - .535" #29 - .580"
#3 - .450" #12 - .495" #21 - .540" #30 - .585"
#4 - .455" #13 - .500" #22 - .545" #31 - .590"
#5 - .460" #14 - .505" #23 - .550" #32 - .595"
#6 - .465" #15 - .510" #24 - .555" #33 - .600"
#7 - .470" #16 - .515" #25 - .560" #34 - .605"
#8 - .475" #17 - .520" #26 - .565" Others to be
#9 - .480" #18 - .525" #27 - .570" added later.
~Some Popular sizes~