Thanks guys, i think i leave it as it is. After 25 years...its ok. The F100 wasn't up to "professional" standards, for my taste,
in terms of - 1) detoriating adheasive, sticky film back door, rubber leatherette 2) film rewind fork broke under torque,
due to material (plastic) fatique. 3) Same goes for the plastic latches, which holds the film door - it can also break, due
to material fatique, again.
The F90(x,s) never had these F100 issues...before. Rewind film fork metal, film door metal latches...and the LCD light still works
bright, like on the day i've bought it. My copy also was never getting sticky, like the film door from my F100.