Re: ATM Astrosystems Ultra-low 1.25 to 2 inch adapter

[Lynne and Larry Manuel <lynneandlarry.manuel@sympatico.ca>]

Richard Keppler wrote:
> 
> On Wed, 28 May 1997 04:12:12 -0500, Suzanne Sarlette/Gerald Pearson
> wrote:
> 
> >I've toyed with the idea of modifying it so that a spring-loaded ball
> >bearing would press against the side of the ep barrel firmly enough to
> >hold it in place,
> 
>  At the risk of making it more complex than need be,

[generously snipped]

My complex plan:  How about [?] having a thumbscrew [or socket head cap
screw] on top of the adaptor, acting on just the edge of a ball bearing
down low.  As you tighten the setscrew, it pushes the ball bearing [or
dowel pin with wedged end] along its little borehole, gripping the
eyepiece.  Perhaps the thumbscrew should have a conical end.  Perhaps
the setscrew could bear on a steel ball, and push against a nylon ball. 
Now that's complex.

Also - a small point - 2 setscrews at 90 degrees are what my guru [Barry
Arnold] recommends.

Larry.

PS:  I convert all my eyepieces to 2 inch diameter with Delrin collars,
parfocalizing the group.

-- 
lynneandlarry.manuel@sympatico.ca