Originally Posted by
look no hands
The hole in the piston rod is normally about the size you say, the buffer washer is normally thicker, so puts pressure on the piston head when the pin is located through the piston rod and piston head, you may need to push the piston head onto the piston rod to get the pin in, obviously the pressure from the buffer washer against the head stops the pin from coming out, although some heads have the pin go through the outside of the head and some locate in the groove the O ring sits in and the O ring also stops the pin from falling out, if I'm honest I'm not completely clued up on the loading taps, I've only ever taken one apart and that was many moons ago, I normally just deal with the Mercury now, like already mentioned, have a look at the nut than holds the threaded cup to the alloy trigger block as they can come loose, if they do then your trigger block will spin and not undo from the cylinder, you will need a thin walled socket (I think its a 17mm?) or box spanner, if you find the trigger block doesn't line up properly with the cocking slot after reassembly then you may need to undo the nut and spin the block a tad to get things realigned and then do the nut back up.