[pianotech] Sealing the air leak on a AMPICO (not Duo-Art) takeup spool (Correction)

[Ron Nossaman]

On 3/19/2012 10:35 PM, Duaine Hechler wrote:
> Was at the customers' today for over two hours - with my doughnut
> punching equipment and still could not get the any punching to work right.
>
> HELP ??
>
> Left flange looks something like this (except with a little more angle
> in (kind of like a reducing nipple)):
> __________
> \__________
> __________
> __________/
>
> The left end of the spool looked like it had a "ball bearing" flange -
> where the inside turns.
>
> What about an rubber "O" ring ?

I take it you DID temporarily attach a hose to the nipple on that left 
hand dead center, but your thumb over the hole in the spool box and suck 
on the hose to ascertain it does indeed leak?


When all else fails, think. Ask yourself two things.

(1): How could a ball bearing be air tight under these circumstances?

(2): Why does the smaller end of the dead center extend considerably 
beyond the bearing onto the take up spool end?

Ron N