It's probably not too bad so long as you didn't lean flat out on the wrench - but you have a taper fit plug not a flat washer fit
Fortunately the thread diameter is the same - so there is less risk of stripping the thread than I thought
You do have less thread reach though - which means some of the threads aren't being used. Might be worth cleaning out the threads a bit before fully winding in the cj8 - just in case it is a bit carboned up in the lower thread
