[R-390] Re: Autotuners 'n' bearing pullers

[Tom Norris]

At one time I made such a puller to remove the bearings
on an old-old score board timer mechanism I was rebuilding
for my high school. Seems to me I used a simple thing made
from a machine screw, a small socket from a cheap wrench
set, a fender washer and an appropriate nut to fit the screw.
I first threaded the old bushing, screwed the bolt into the
threaded bushing, then using the socket affair as an "anchor."
slowly tightened the nut until the bearing/bushing popped out.
The replacement bearing was tapped into place with a rubber
mallet driving a piece of dowel.

Dunno if that would work with the bearings in the '391
mechanism.

Tom NU4G



>
>I would not risk the casting with a punch. The bearings may have been
>pressed in with some kind of glue.  They take up a large proportion of the
>small protrusions of the casting.  Very high probablilty of snapping off one
>of those.  Something like a miniature gear puller might work -- also heating
>with a torch -- maybe the aluminum casting expands faster than bronze?
>
>Anyway, I have a spare casting with shaft and bearings in good shape, so
>I'll go that route first.  But, what I need first is to get a round tuit.
>;-)
>
>Barry
>
>
>
>
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