I have an Aleph mule head which I disassembled, I am now having trouble seating the last third of the outer o-ring back into its slot. Does anybody have any helpful tips please?
I use a razor blade to cut the end off a wooden toothpick, making it a blunt end.
Then use the blunt end of the toothpick to slowly work around the perimeter and work the o-ring into the slot.