ME Super shutter cocking fault

I recently bought a black ME Super which was described as "working". To put it short, it doesn't, but as I only paid a tenner for it and it's pretty tidy I'm not sending it back (it's worth that as spares). I'm just wondering if it's repairable...

The fault is that the shutter hardly ever cocks. The wind on is fine, but it isn't cocking the shutter. Very occasionally it will, but not reliably. Weirdly if you leave it for a bit then wind on it'll cock. Leave it again and it will do it again. Try to wind on, click, wind on, click and it won't work! Any ideas? I have looked at a website dealing with ME Super faults but my problem sounds more as though something needs to be wiggled to free it, rather than the camera needing to be completely dismantled.

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If this doesn't help all I can suggest is get a silver body and swap the black bits across, then sell the rest for spares.

Shutter faults are a pain on the 'M' series, and not easy to repair, unless you're an engineer!

Yep, that was the one. Problem is, while I can follow things like "unscrew the front element group, swab the fungus off with vinegar, polish clean and reassemble" I'm not quite up to the standards set by that chap! I tried flooding the mechanism with lighter fuel (my usual approach to un-jamming cameras) but it didn't seem to make any difference.

I might keep an eye open for a scruffy but working silver one and swap the parts, I realise having it professionally sorted out will probably cost more than the camera would be worth!