The uprights are 1/2" x 3" and the pins are 1" grade eight.
The bolts in the upper bridge are 3/4" grade eight.
The upper bridge for the cylinder carriage and bed are made from 1/4" x 5" channel and reinforced with 3/8" x 4" flat iron.
It is modeled after a 30 ton Enerpac press I used to use before I retired but is built a little heavier.
The commercial Enerpac used a small hydraulic hand pump for raising and lowering the bed which I didn't care much for but I did copy their vertical bed carriage design. It negates the need for stringing another cable around to the other side of the bed.
The winch handle is detachable as it would be in the road other wise. The winch also has a half moon shroud made of 14 or 16 gauge sheet metal to keep the cable in place and to keep it from "bird nesting", and works well.

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