To rebuild a capstan for the Hp-85, 9815, 9825 tape drive, you need:

- Dremel tool + #402 mandrel + #194 HS cutter.

- Very fine sandpaper 3M 255p or similar,

- Pliers to hold the joint.

- Silicon tap joints: D10mmxd4mmxT4mm.

- Cutter or X-Acto
  • BEWARE of the "Conic" effect!!
  • Change joint orientation on mandrel to ensure symetric sanding
  • Left: basis joint. Right: finished outside joint.
  • Same as previous
  • For the inner perimeter: use #194 HS cutter
  • Speed=10000rpm
  • Secure capstan in pliers: cutters are DANGEROUS!
  • Machine from both sides of the hole