The design was changed after the first fabrication. Instead of using a hose clamp to hold the PVC pipe in place, the design was changed back to the original idea of using a bolt. This was done because better materials (better size PVC pipe) were found that suited this method.
After the PVC pipe was cut to length, a hole was drilled through the pipe and the crutch frame using a drill press.
Drill Press
Next, a slot was cut on the side of the pipe so an additional bolt could slide up and down.
Slot, drilled then cut with knife.
Finally the entire system was assembled. The bottom half of the crutch is bolted to the PVC, while the top half with the arm rest freely moves up and down with the spring. A bolt passes through the top crutch frame and through the PVC slot. This prevents the top of the crutch from falling off, and allows the restriction of its movement with two hose clamps. The clamps can be slid up and down to allow full motion of the spring, or they can restrict the movement to a smaller displacement.
Shock absorber assembled.
Final design.
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