[pianotech] PVC-E and keytops

[David Ilvedson]

That's a good idea, which I haven't tried...a sizing application...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Jon Page" <jonpage at comcast.net>
To: pianotech at ptg.org
Received: 11/27/2008 4:57:25 AM
Subject: Re: [pianotech] PVC-E and keytops


>I use PVC-E glue for keytops as many techs do. Maybe your first set failed
>because the glue wicked into the porous keystick and the joint was starved.

>After planing to develop a clean surface and attend to reestablishing
>overall keystick height (to maintain a relation with the sharp) apply
>a sizing coat of glue to the key. This will keep the glue from wicking away
>and maintain a bond.

>Clamping is usually not needed after a firm mating. If you are using tops
>with the fronts attached and they don't mate well at the front then clamping
>is needed. A rubber band will suffice for the front with a slat and 
>spring clamp
>for the top.

>If there is an extended shoe on the bottom of the key, the elastic can be
>placed around the back of it and stretched to the front. Otherwise, place
>the elastic around the key (top to bottom) at the back of the button; cross
>the bands under the key and stretch to the front. Certain applications
>may require the additional use of a push pin somewhere strategically placed.
>You want the pulling force to approach the front from the bottom in an effort
>to draw the plastic unit downwards. Apply slat and clamp the top.
>-- 

>Regards,

>Jon Page