ATM Tinsley 26" problems-opinions needed

[astro <astro@magicnet.net>]

    The 26" Tinsley-Cassegrain housed in the Robinson Observatory at UCF
has recently developed problems, in addition to other problems which
were already known.  Last friday we were testing the computer interface
when we noticed what appears to be a double image at focus.  When
targeted on a known single alignment star we get what I can only
describe as a second star image adjacent to and almost separable from
the primary target (asci art  o*  ).  This double image at focus is a
recent development and puzzles us as to cause.  We have also noticed
problems before, however we have allowed time for the telescope to get
used again after its restoration several years ago, to see if the
problems would get better once the mirror was placed in the cell.  The
best way to describe this problem is that when the scope is defocused
using a 13 mm Nagler eyepiece we get an image similar to that displayed
on page 245, middle pane, bottom row.  We have bidden our time, thinking
that the tube currents may have been coming into play, however, last
friday the scope was at perfect equilibrium and the image was worse than
that displayed.

    The telescope was made in the 1960's and uses a full size mirror of
26" dia. by 4.25 thickness and weighs 450 lbs alone.  The mirror rests
on a 18 point cell with a retaining ring and clips to the front and 6
pads affixed to prevent radial movement.  The telescope operates at
F/16  or 10566 mm ( yes the star test was at 817 power).

1. We are seeking opinions as to what may be causing the second image?
2. Are there tests we can conduct in place?
3. Does anyone know of a reputable company that can refigure (if
necessary) this mammoth piece of glass?
4. Does anyone know of a company that can aluminize the mirror,
reasonably close to Florida?

Computer related question
1. Does anyone have experience with gearing up 4000 tick encoders 4-1 to
16,000 ticks outputting to a SkyWizard3 and then to The Sky ver 4.0?

    All suggestions are welcome and I know that considering the quality
of ATM'ers here, we should get some new ideas.
    BTW - This telescope is one of  the largest telescopes available to
Amateur Astronomers on a continuos basis.
    Many thanks in advance

    Frank Sperl
    Chairman - Robinson Observatory Committee
    Central Florida Astronomical Society