I've had some more "fun" tonight trying to sort out bits of dead Relum underlever pistols. I had already found that there are two lengths of piston rod, that stick out the back of the piston either 13.5mm or 28mm (14.5mm difference)------but tonight dsicovered that the rods are different thicknesses (5.8 and 6.2mm) and different threads into the piston and the head that holds the piston washer on. Also, the guides I have, will not go over the thicker rod and if the guide is opened up a little, then it wont fit the inner mainspring! This makes me wonder if they all had guides or at some point they let the inner spring act as a guide.
I don't know what sort of numbers these pistols were produced in, but so far I have see them in .177 and .22, grips with and without holes in for the shoulder stock, 2 different types of piston and 2 different types of rearsight. These variation don't seem to be dependant on calibre.
Update. WE HAVE A PULSE! A sear swap got the thing cocking and firing, so I am now waiting for another sear to arrive and i can set about getting it "something like"
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