Retina IIIc 028 Slow rangefinder
Hello. Just got hold of a Reinta IIIc t028. Its in a pretty good shape, lightmeter is working ok, but when I focus, the visual rangefinder patch is a little slow to follow up the lens movement; there is a time delay between moving the lens and the focusing patch moving to catch up with the movement made.
Probably there is something sticky in the rangefinder mechanism, due to being left unused for a time (it belonged to my father and I know he didn't used for a very long time, if ever, he had other favorite cameras).
Question is, how should I check it? should I remove the top cover and use lighter fluid? any idea?