Welded Parts Shrinking on NPC

I’m guessing that resizing the Union is the issue.
Unions have a ‘memory’ of the changes that were done to them. The AutomaticScalingEnabled property may be picking up any resizing done in that memory.
That’s why I suggested remaking the Union at the exact size you want, not just resizing it.

What do you mean, remaking the Union at the exact size?

Take your resized Union and make all the Parts & Negated Parts necessary to recreate the Union at the correct scale, then Union them.
This way when you use the new Union would be the exact right size to start out with and wouldn’t need to be resized.

Think of it this way for example:
You start out with a Union that’s 2 studs across.
You resize it to 1 stud across.
You have scaling issues on a Humanoid.
Build a NEW Union that’s 1 stud across.

Can’t you resize a union and union it? It makes a new union from itself.

Do you mean resize it and break it down into all it’s Parts (which means returning Negated items to Parts again) and then Union it? That might work.

When I’ve resized Unions then tried to ‘un-union’ it again I always get a warning (from my memory something like ‘Scaling issues may occur’).

I mean resizing the union, selecting it, and pressing control shift g

Yes, but the ‘memory’ of that Unions history is still stored in the Union which may still cause scaling issues.

I can’t go into Studio right now.
It’ll be very easy to try taking 1 of your wrist Unions that have been scaled to the size you want and using the 2 new Parts necessary (I’m guessing you have 2 Parts crossed like a + sign, maybe 3 or 4 Parts depending if it’s hollowed out) to create a correctly scaled entirely new Union.

Put that on your NPC and test to see if it fixes it. Then you’ll know if that was the original problem.

I used four parts, one on each side.

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