on a gun such as this, i also advise a steel shim. i have soft soldered them on, using the lowest temp solder i had. but on the last one i used loc-tite 380 Black Max. it needs to be used in cases where the part is in compression, as is on a hook and pin situation.
get the best fitting shim you can, and then assert pressure to make the shim closely fit the hook. i have used dowels or steel rods roughly the size of the pin.
the Black Max REALLY (!!!) bonds metal when used properly. in my experience it is at least equal to, and i think a tad more, strong than Hi-Force 44 solder.
