RE: Electric Jackscrew
Flypaper,
If you use just a DPDT switch, with 2 NC end travel limits. When it reaches the end it won't be able to turn back on again! I've looked and 3PDT switches are available as toggles or you can gang using bolts 3 SPDT switches from Radio Shack #275-017 for $2.69 each SPDT Switch with 3/4" Roller Lever
John