Nearly a disappointment...
I got my Olympus OM4T on Ebay for a really good price including some good lenses. There must have been something in the description or profile that set off alarms because I faced no competition on the bid.
When it arrived the body was pristine with only a microscopic mark on it. It looked like it had never even had a roll through it but it was seriously jammed.
I popped off the bottom plate and tapped and pried until I tripped the shutter. It has worked perfectly since.
I'm sure the seller knew it was jammed and was happy to push it off to a sucker (me) but I win and I didn;t even need the BFH !!