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
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