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Tapered Mandrels Set

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Item #2066

Availability: In stock

$295.00 Each

Quick Overview


Our Curved Mouthpipe Tapered Mandrel and Driver Set is designed to remove dents from a variety of brass instruments that have a curved mouthpipe. Unlike the standard barrel shape dent balls that can result in swelling and ridging, our mandrels are designed with a straight taper to provide maximum contact area to restore pipe to its original integrity.

The driver and mandrels work by removing the main tuning slide and inserting the flexible driver into the mouthpiece receiver, through the mouthpipe, and out the end of the slide receiver. The desired size mandrel screws onto the end of the driver cable and then pulled back into the mouthpipe and up to the dent. Severe dents can be 'roughed' out by pulling hard on the driver to force dent up and then finish off using a dent hammer.

All mandrels are 1/2" (12.7 mm) in length and are precision machined and polished from quality, highly corrosion resistant, magnetic stainless steel, allowing the use of a magnet for mandrel location while still providing excellent resistance to rust and corrosion. Each mandrel graduates 0.005" (0.127 mm) in diameter from one end to the other. The set of 50 mandrels covers a diameter range between 0.300" (7.62 mm) and 0.550" (13.97 mm), and is designed to work on mouthpipes for the following instruments:

  • french horn
  • cornet
  • flugelhorn
  • mellophone and other small bore marching horns

Comes complete with:

  • 50 Tapered Mandrels with 8-32 threads
  • Flex Driver with 'T' Handle - length: 48" (1.22 m)
  • Indexed Storage Case with Lid

NOTE: Our YouTube video for this tool shows the mandrels having threads. We have since determined that the tool works more efficiently without threading onto the flex cable and so mandrels are now designed with a through hole.


SKU 2066
Variant 1
Sold by Each


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