Well they used to use the rivets to hold the trunnions then theyd silver solder them in place. if you want to make it easy just use torx scres in place of the rivets, then you can silver solder if you want or putthread lock on the threads. i have a set of rivets that are supposed to be for the sten, let me think about it i may sell them because im going to screw muild my sas3. Hmm my 2 rods are threaded on one end to screw into the slug, you may want to contact them on that. Good luck. im making mine a pistol so i can get around the 922r crap. although the pistol grip i got is to big i will make it work. I just need to cut about a 1/4 in out of the top and bottem then reweld.