N10-N11-N11A Expandable Dent Removal Tools
N10-N11-N11A Expandable Dent Removal Tools - N10 For tenor inner slides is backordered and will ship as soon as it is back in stock.
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Warranty & Returns
Warranty & Returns
Standard tools manufactured by Ferree’s Tools include a one-year limited warranty against defects. Eligible standard products may be returned within 30 days of the invoice date with an approved RMA number. Returns after 30 days may incur a restocking fee, and returns are not accepted after 180 days. Custom-manufactured products cannot be returned.
Delivery and Shipping
Delivery and Shipping
Most in-stock products are prepared within 24 hours and shipped within 48 hours. Free standard shipping is available worldwide, with processing fees of $10 for domestic orders, $20 for Canada and Mexico, and $30 for other international destinations. Chemicals must ship by ground and cannot be shipped overseas. Expedited shipping is available for an additional charge.
Built for Musicians
Purpose-built tools and supplies designed for accurate, efficient instrument repair.
Description
Description
A tool of specific size such as an N53 Mandrel cannot work equally well on both the beginning section and the bottom section of the slide. This is because the first 4 inches of the slide is from .002 to .010 (.05mm to .15mm) smaller than the rest of the slide on 90% of all trombones. This is caused by shrinkage of the tubing when the hand brace or outer sleeve is soldered on. This can also be caused by the slide being jarred in such a way that the hand brace is pushed slightly into the slide. Using the tool is simple.
First, clean the trombone slide thoroughly with F7 Brasso, Z10 Cold Cleaner and a dry cheesecloth rag as per our standard process. Put the tool in the vise and slide the trombone slide loosely over the tool. Turn the adjusting nut until the expandable working part of the tool is snug under a portion of the tubing that is dent free. Then, merely slide the trombone slide back and forth over the working part of the tool with a slightly rotating movement. This will produce a smooth burnishing action. The tool is polished chromed steel. It will not burr or scrape the inside tubing. Rotate until the slide feels smooth. Remove the slide and wipe it out with a clean length of X50 Cheesecloth. The dent will probably have disappeared; if not, repeat the operation with the adjusting nut a little tighter.
N10 For tenor inner slides 7/16" (11.1mm)
N11 For tenor outer slides 1/2" (12.7mm)
N11A For bass trombone outer slides 9/16" (14.3mm)
N1011 SET OF THREE ABOVE EXPANDERS
Payment & Security
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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.
Frequently Asked Questions
How do I choose the correct size or model?
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?
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?
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.


