The Pronation/Supination Attachment
1. I first cut a 3 1/2" length of 1 1/2" ABS so that I could brace it cross-wise in my mitre box, where I cut an approximately 3/8" slot, lengthwise.
2. Cut a 1 1/2" length off the end of the slotted ABS. Then cut a sheet of 1/4" rubber 1 1/2" x 3 5/8", and a 3 1/8" length of 1 1/2" webbing. Singe the edges of the cut webbing with a flame to seal them and to prevent them from unravelling.
3. Roll the length of rubber up tightly and fit it into the ABS such that the gap in the ABS remains unobstructed. If all that is available to you is 1/16" rubber, laminate three sheets together using rubber cement (not four sheets).
4. Put a few dabs of Super Glue on the exposed surface of the rubber and press the webbing onto it, aligning the edges, and being careful not get any glue on the exposed surface of the webbing. Just a little glue is needed - just enough to hold the webbing in place.
5. Cut 1" lengths of PVC as shown and assemble the handle without glue to make sure that everything fits and is reasonably square. Next, glue the components of the "Tee" together first, using Super Glue. Use a liberal amount on the connection where the 4" stem will be. On all other connections, very little glue is needed. Assemble the rest of the handle and square it up. You'll have to move relatively quickly on this before the glue dries. DO NOT use PVC glue! I made the mistake of doing this. The glue dries faster than you can put the handle together and square it, and the PVC glue is not strong enough to hold the stem in the TEE when the exerciser is tightened way up. When that happened to me, I reattached the stem with Super Glue and it is now holding just fine. And, if the situation should ever arise, you can always drill a hole through that connection and secure it with a bolt. I used 1" pipe insulation for the grip.
6. Attach hose clamps as shown to the side of the (or any) machine, and then, using the picture up top as a guide, assemble the whole thing.
Now you're in business! Obviously, you tighten or loosen the hose clamp to control the amount of resistance provided. Having a socket wrench on hand is the quickest way to do this. You could rotate the handle back and forth, or you could rotate the handle in one direction, hand-over-hand, adjust the resistance, and then rotate it in the other direction, hand-under-hand.
And what else could you do with this nifty clamp, or another one like it? You could slip a length of 1" PVC through it for a wrist-roller and beef up the ends with grips (go to Useful Info for grip ideas), or anything else you can create!
- Shenandoah
