Hi, Marc.  As a newly qualified restorer I would like to offer my 
opinion so as I know whether or not I am doing things right!  I am 
sure that the other subscribers will correct me if I am wrong.

Bridle straps - I have just fitted a clip-on set to an Underwood Piano
action (Boston Mass.) and they seem fine.  They clip firmly and do the
job.  The alternative - to drill out the balance hammer shank simply to
accommodate the tape end - seems unthinkable.  As long as the length is
correct and they hold their position where is the problem?

Key tops - I would have thought that the use of a proper buffing wheel
with white soap would restore them properly.

Tubing - I use only the best thick brown rubber tubing - no plastic, or
even worse - auto hose!

Wind Motor - I think that the Player Piano Co. would stock some hinge
material, but I imagine others may have more local sources.  What is it -
pillow ticking - that is supposed to be used? Does anyone find a good
alternative?

Yours tentatively,  Roger Waring