http://web.ics.purdue.edu/~bill/1937pu/partXIXf.html
http://web.ics.purdue.edu/~bill/1937pu/partXXf.html
These are actually for a vehicle, but I don't see you couldn't make
some for wood projects.
JOAT
It's not hard, if you get your mind right.
- Granny Weatherwax