Aid,
Seriously, seek professional help.
Your .38 isn't a watch & you, again, don't know what you're doing.
Messing with a busted hand is not something for a novice to be tinkering with.
One facet of responsible gun ownership is knowing your practical limitations, understanding that there are often invisible complexities involved in parts' construction & relationships, and realizing that swapping grips is a kitchen table job, while repairing or replacing a busted hand that controls timing is not WHEN YOU DON'T KNOW WHAT'S WHAT.
Dinking around with that pin is not even something most gunsmiths would do.
They'd replace & fit a new hand. Messing with the pin would be a last resort used only if a new hand was not available.
There's more at stake here with a device that explodes things than just messing up a timepiece.
Denis