How do I fix a character model's joints using a script?

When I play a game the character model I am using, which does not use attachment for joints only motor6's, their arms and legs and head disconnect. Is there a way to fix this issue?

Is there a script that can resolve the issue with the absence of a motor6 in a character model?

Alternatively, I know what the player's character model name is, so is there a way to load the character model properly?