[Shop-talk] building a gorilla lift

[Jim Ferguson]

I built one like that for my wife's horse trailer.  I used an old garage 
door spring that a pile of "stuff to save because you may need it 
someday".  I have no idea of the rating of the spring.  It was a lot of 
trial and error.  I ended up with a compound pulley system and attaching 
at he midpoint of the ramp.  I put the spring in a length of plastic 
pipe for protection. It has worked well for many years.

The spring was almost 3" in diameter and  about 2' long.

Jim