the pins slide up/down so as long as you can trip them you can waggle an old key to turn it, else as they are brass you can sometimes strip them. good luck!
yeah you were crushing the pins Jeff. they are actually flat sheet and oriented to have the thin side as the lock, so you need quite a bit of force to mash about 5mm of brass to get it thru. Defo need to trip the lock tho, it wont usually work just destroying the plastic parts. you can sometimes push and twist them as well to get them out, but beware damaging the sealing surface by lifting the opening. Its a job that demands patience and brute force LOL
Hello Gents, cap off , 1 Hour job after night shift , tank is fine, but my patience was wearing thin by the end . There is a fair amount of loose rust inside . will need to get a camera and have a look in there . (bugger) Then its time to repair and seal the inside .
Casho