OK, after finally figuring out how to remove the split pin..I found it wasn't broken ..but after comparing both doors one creaked one didn't i found that the good door had 'cup washer' made of a clear very strong plastic [nylon ?] which acts like a sleeve for the split pin to sit in ..but doesn't allow it to squirm around as in the creaky door...to test I changed this cup washer into the creaky door it then became quiet and good door sans the bit became noisy...so as it turns out the local auto joint doesn't have this item as a stock line altho looking at it it would seem to be a common part, so i may have to source from dealer parts shop, ....so for now I purchased some plastic fasteners [hollow plugs] cut the bottom off them so the pin could go thru and put these into both doors for now..they are not silent but are much quieter and smoother open /shut..if anyone's interested I can take a pic of the 'part' and my replacement..