I thought I would leave this information here, which has worked well for me this year.
I had three synchro compur shutters which were stuck. I removed the lens and carefully sprayed either side of the cocking lever with silicone spray.
The shutters having been working properly now for the best part of a year without sticking or hesitation.
On one of the shutters the silicone reached the shutter blades, but had no detrimental effect at all. I think the shutters had been idol for years and years when I bought them, as the optics were perfect, so in these cases a lack of lubrication seems to have been the problem.
It was my intention initially to send them away for servicing, and using the silicone spray was a "nothing ventured, nothing gained" attempt at getting them up and running. I'm glad I did.
I tried the same process on a Prontor shutter, but did not have a positive outcome with that.
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