I cut a short piece of inner tube of slightly smaller diameter than the drive
spool, and roughed up the inside surface and the spool surface for gluing.
Then I applied a little contact glue, stretching the inner tube by
using a pointed skewer and rolling it under the surface. Even it out
by going around twice and applying a little glue on the second turn.
Glue around each edge seals it well. In each organ only just enough
spring is required to engage the clutch, giving great torque, far more than
This modification has been working well on my Busker for 3 years, and my
Senior for 2 years with no problems, so I have applied this to my John Smith
Universal 26 as well.
It is possible to build up the drive spool tyre by adding 3 or 4 layers of
inner tube, to speed up the drive. After 8 years, mine still works