RiscPC Spring Insert

This is a drop in insert to fix a snapped spring leg for a RiscPC case. They tend to snap off as the cases are now 30years old. Just hook the existing spring around the little catch, then drop the insert and spring in from below and attach to the sliding door.

After some reports of the catch snapping, v2 now has more support.

For even more protection against snapping, v3 replaces the spring recess with lugs.