Jackrail

The jackrail sits over the register gap and keeps the jacks from flying out of the instrument when the keys are pressed. Its ends slide into grooves milled in the jackrail support blocks.

I made the jackrail from a scrap piece of the quartered western red cedar used for the baseboard, and glued pieces of Alaska yellow cedar to the three visible sides. Then I routed a decorative molding along the top edges, using the same bit that provided the profiles for the soundboard moldings and bridge:


The jackrail is 3/8" thick. The ends were reduced to 1/4" to fit the jackrail support grooves.

On the underside I'll staple one or two layers of 1.5 mm felt cloth to stop the upward travel of the jacks. The cloth doesn't need to absorb the full force of playing the keyboard because the head stop under the keys takes some of that impact too. What's needed is for the jackrail to arrest any further travel of the jacks once the keys have stopped moving. This avoids the unpleasant feeling of the jacks hopping upwards, bouncing off the jackrail and landing back on the key ends, which results in an odd jiggling sensation under the fingers.