Re: Vintage film cameras
Yoko once the WD40/Plusgas has soaked in the you could try tapping with a hammer and screwdriver. Position the screwdriver in the slot so it is tangential to the screw threads and tap gently, swap to the other slot after a while so you're also pushing it back and forth. Works well for stuck bolts/screws, the shock gets things moving and normally the bolt doesn't need to turn far to relieve the grip it has in the hole.
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