Can you change the CFrame of the PrimaryPart by a script when they're welded?

Quick question: Can you change the CFrame of the PrimaryPart by a script when the parts inside the model are welded?

yea you can it doesn’t affect anything

Then why is my script in StarterCharacterScripts not working?

The screenshot of the script:
Screen Shot 2021-04-13 at 09.55.18

Firstly are there models that have primary part in the character? like send a pic of the explorer. Second. Its client sided try doing it on server sided

Well I can see that there are primary parts, and I tried to do it server sided yet it doesn’t work.

P.S. I tried to do it with startercharacter not the players character because I don’t know how to find it.

I tried to do with player parameter yet it still didn’t work.