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Not sure if this will help anyone or not, but I'm fully magnetizing my GKT arms and I have a list of magnet sizes that worked well for me:

Special Weapon Arm: 1/8" x 1/32"
Special Weapons: 1/8" x 1/32"
Shoulders: 1/8" x 1/16"
Torso (connecting to shoulders): 1/8" x 1/32"

Nemesis force weapon (wrist): 1/8" x 1/32"*
Nemesis force weapon (hand): 1/16" x 1/8" (cylinder magnet)

All magnets hold strongly enough such that arms do not slip due to weight and can be fully posed, allowing for the ability to make use of any weapon combination in the kit.


* This needs to be done very carefully as it will leave the plastic from the arm very thin. Maybe consider a fatter cylinder magnet that will require a narrower hole.

I've been magnetizing the shoulder joints, using the same size as you. My main issue is you have to be really careful when drilling into the torso not to go too deep yet still go deep enough to have your magnet flush.

I haven't even attempted hands yet..kudos to you for doing it.