Steelsewing

I've given this some thought and I think (?) I understand the dilemma: to be able to use one cabinet and easily swap out machine heads with little to no effort. Having the spring plate there or not there doesn't really assist all that much with wire disconnect and re-connect. You still have to unscrew the plug receiver screw, reach around and undo two of the twist nuts, remove the pedal/knee control wires... and then reverse all this when you slip in the other head. This would be particularly true with a 15-91 and 201 swap.

The easier (?) way to accomplish this would be if there were some other kind of way of removing those two wires and then reconnecting. If you were to say.... find a spot in the run of the wire from when it tucks into the hole on the spring plate... say 6 inches away from the hole on the inside of the cabinet.

Now, cut one of those two wires and add a splice, and then measure two to three inches from that splice and cut and splice the second wire. Then, add these wire connectors. You want to leave a a couple of inches between each splice one so that one end of the splice connector can easily slip through the hole in the spring plate.

You'll need to make one full set, and then another half set. Say you put the male splice ends on the sewing machine side, and the female on the knee control side. Now you need a duplicate set of male splice end wires for the second machine. This way... the wire sets stay connected to the machine. No fooling with wire nuts or loosening the plug receiver. It would save a lot of time and hassle and you'd be able to switch back and forth way easier.

[ATTACH=CONFIG]610234[/ATTACH]
Here's the idea on paper

and here's a link to the sort of wire splices that I could find online that might work.

Is this closer to what you had in mind?