After removing the old plectrum, you may now insert the new plectrum. Plectra usually have an "up" and "down" orientation which has to do with the side from which the plectrum was punched out. You must feel the surface of the plectrum for rough edges; the side that has rough edges is "up", as it will tend to curl up. Insert the plectrum, rough towards the top of the jack, through the back of the tongue. You do not need to use the needle nose pliers for this, but you may find it easier if you do use them. Supporting the tongue from the front with your finger, push the plectrum in until it sits firmly in place. If you can push it back out from the front with your finger, it needs to pushed further. I usually use the end of the jeweler's screw driver to secure the plectrum. If you are revoicing a wood jack, be careful not to force the plectrum through the mortice, as you may end up splitting the tongue. If there is more than 1/16" of plectrum left standing proud of the back of the tongue, trim it off with your Xacto knife.

A brief thought concerning knives: keep a supply of fresh, SHARP blades at hand. Nothing will make voicing more frustrating than not having a very sharp knife. Personally, I prefer Xacto knives because they are sharp, easily available, and stiff. Surgical scalpals can also be used, although I find the blades a bit too flexible.

The next step is to trim the plectrum to its approximate length. You can determine the length it needs to be by placing the jack back into the harpsichord and observing where along the plectrum the string lays. Holding the jack inverted against the voicing block, with the plectrum resting on the top surface of the block, slice off the appropriate amount of plectrum with your Xacto knife. The cut should be at a bevel so you end up leaving the plectrum slightly long.Next, make a beveling cut from the base of the plectrum out to the tip along the left edge, removing a sliver of material. Use the very tip of the knife, and don't try to remove too much material at once. One or two cuts ought to do it. If your knife wants to dig in and cut off too much, it may be that it is dull, in which case, change blades.

Now repeat the beveling cut on the right side of the plectrum. Lean the jack to the left, raising the right side of the plectrum, and bevel the right edge the same way you did the left. These beveling cuts on the left and right, like all subsequent cuts, will vary according to where the jack is on the string band. Bass notes require heavier plectra, and treble notes usually need very light plectra. To a certain extent this variation can be accommodated by using plectra of different thicknesses, but in the end, you will have to trim them to get the best sound. When you have finished beveling the right side, the tip of the plectrum should be triangular in cross-section.