On 2010-12-12, Wes wrote:
Ignoramus13683 wrote:

On top of the head, the pulley shaft is hollow and I can mount
something in there, but then I would have to account for the back gear
and it is slightly messy.

A rod, very close fitting, with an o-ring groove and o-ring to cause it to grip to the
hollow shaft. Use more o-ring grooves and o-rings if you have slippage during start/stop
Easily removable.

OK, this seems to be a good option. I would like this to be a tight
fit, so that I would have to use a hammer to push it in, and a puller
to pull out.

The shaft is 25.94 to 26mm ID. Given that, what would be a good option
for O ring diameter (ID and OD), so that they would compress
properly.

I am thinking to buy 26mm O rings from McMaster, and make grooves so
that the O rings are slightly stretched and stick out to perhaps
26.5mm.

I also see a lot of rubber tube expanding plugs at Mcmaster. I am
thinking that they may provide the easiest option.

i