REPARING
After final adjustments to the right arm, I get it ready to be repaired.
• I first cut/shave away enough of the area that i'll be repairing to fix.
• I then mix a small amount of epoxy putty that i'll use to reinforce the joint.
• I apply some superglue to the inside of the joint and then wedge the epoxy putty in the gap.
• After the epoxy is dry, i add vaseline and apply the supersculpy firm.
• Lastly i refine the clay with my sculpting tools and smooth out with turpenoid, before using my heat gun
SWAP-OUT-PARTS
I'll be using heavy duty magnets inorder to hold the hand and arm together while still allowing for replacement hands/parts to be swapped in. I have found that these magnets are perfect for 1:4 & 1:5 scale sculpts.
After the arm is fixed I use my scroll saw and cut off the hand at the wrist. I then use a 1/4" drill bit to bore out two small holes just big enough to fit the magnets: one on the arm side and the other on the hand side. You can use the superglue or epoxy to hold the magnets inplace. At this point i should beable to sculpt a hand holding a weapon and easily switch it out with the clawed version.

I then place the arm back on the body to make sure everything still looks good before starting work on the other arm/hand.