Something else to watch for, the Hi-Matics were known for developing a loose lens barrel to body joint. This is not a simple fix. My Hi-Matic 9 is just starting to get that way, but it still shoots crisp and clear. My Electro 35 GSN still has the original pad and its doing just fine. I actually went inside to replace it at the same time as the rest of the seals but it was perfect. The lack of the thunk in yours I a simple adjustment of the rod under the bottom cover. It can be a bit fiddly getting all three movements synchronized with just two adjustments, but its not difficult. Go slow and listen carefully when adjusting.
The C35 is a nice and compact little camera as well. Should still be found under $40 if you look hard enough.