Parts needed:
1. Set of large MF nylon hand skeletons in 204 eye bolt configuration (https://mfcreations3d.blogspot.com/) along with wire and pan screws (No. 4 x 1/4" Stainless Pan Head Phillips Wood Screw, (100 pc), 18-8 (304) Stainless Steel Sheet Metal Screws, https://www.amazon.com/dp/B07D1LPCPN?re ... tails&th=1)
2. 4x M8x1.25 Connector nuts (M8x30mm Round Connector Nuts) https://www.amazon.com/dp/B07YXXPF2G?ps ... ct_details
3. 2x M8x1.25 Rod ends (8 Male Rod End Bearing M8x1.25 Right Hand Thread, Self-Lubricating Joint Rod Ends)https://www.amazon.com/dp/B0C7N1SR8X?ps ... ct_details
4. 2x M8x1.25 Threaded Rods (M8-1.25 Fully All Threaded Rod, only about 125mm needed but better to get longer and cut shorter) https://www.amazon.com/dp/B08FQL7LXV?ps ... ct_details
5. 2x M8x1.25 Clevis Joints (Bettomshin 2Pcs Air Cylinder Rod Clevis End, M8 x 1.25 Female Thread Y Connector, 40mm Length 8mm Joint Inner Distance Quick Connector for Air Cylinder) https://www.amazon.com/dp/B09LLYD9M9?ps ... ct_details
6. 2X M8x1.25 Allen Head Button Bolts
7. 2x M8x1.25 Flange Nuts
8. Blue Locktite
9. Small roll of medical tape
10. TPE paste to seal up when done. Make sure you have this made up before you cut anything.
Tools needed:
Vise grips
Allen wrenches
Deep sockets or box wrenches
Razorblade/Hobbyknife
Angle Grinder/Dremel/Hacksaw w/files
Masking/Painter's tape
Modification Steps:
Step 1. Feel down the wrist and see if you can find the M8 nut welded to the wrist assembly. See if it turns. If so, this mod should work for you.
Step 2. Take your blade and make an incision where the clevis joint will be (use the joint in your own wrist for reference). This will be small. TPE stretches a lot. You won't need a cut more than about half an inch long.
Step 3. Find where the wires enter the wrist assembly and pull them out. Odd are if you're doing this, wires are already loose or broken, but you want them all loose. They are inserted into springs and not glued so should come out without much effort.
Step 4. Unscrew the wrist assembly and remove. Wrap the bolt threads on the arm skeleton with masking tape to keep the grease out of the TPE until you're ready to assemble the new wrist.
Step 5. Take the vise grips and remove each wire from each finger. This will require constant pressure and gently unrolling the TPE from the thread and wire it is adhered to.
Step 6. Now you have all the old stuff removed. It's time to assemble the new stuff. Make your new hand skeletons using MF's instructions and make sure everything functions correctly. Then remove the screws holding in the base of the fingers.
Step 7. Screw in your tie rod bolt ends to the skeletons completely, making sure the grease fitting points toward the inside of the wrist. Then cut one side off your clevis joints. You will need a grinder or hacksaw for this. Either way, make sure the cut area is smoothed over by grinding or filing so it doesn't retain a sharp edge that could damage your TPE. These are hardened steel meant to take brake cylinder hydraulic pressures so will still be super strong with only one side.
Step 8. Remove the tape from the skeleton arm threads and Locktite a connector nut to the arm skeleton. Use vise grips to tighten well. This provides a place for the rod extension to connect.
Step 9: Test fit threaded rod extension. Grab your built hands and figure out how long it will need to be to fit the clevis joint in the right place. Mark where to cut rod, then cut, making sure you don't damage the threads. One 250mm threaded rod was enough for me to do both arms, but getting two lets you have spares for if you screw anything up.
Step 10: Test cut rod with clevis and hands mounted to make sure it is the right length to fit into the fingers.
Step 11: This is a delicate one. You will need to roll the palm inside out like a sock then cut the channels between where the old wires went to be able to fit the new palm skeleton in the hands. Take your time and be slow and deliberate. Cut in the center and know how close you are to reaching the actual fingers.
Step 12: Thread another connector nut over the threaded rod (this will make the arm smooth all the way to the wrist) and then your clevis joint for one final test fit outside the hand. Tighten and Locktite the Clevis joint to the skeleton if good. DO NOT Locktite the wrist to the Clevis joint yet.
Step 13: Have the fingers, palm and wrist separated into different parts. Insert each finger into the hand. Screw them all to the palm when complete. Test joints and look of TPE over skeleton. Then bolt wrist to clevis joint, tighten and Locktite.
Step 14: Wrap the wrist in medical tape. You want the cloth kind so the TPE paste will adhere and glue everything together.
Step 15: Fill the wound with TPE paste and cure, then smooth and texture.
Then enjoy your more functional prettier gal.
