I would suggest the same as John, only thing that might be difficult is if there was glue applied to the rod before it was threaded into the block or the knob. The one thing that I am doing with the stops that I am installing, is in addition to gluing the block, I try to put 3 nails into it also so that I hopefully won't run into this problem.
Interesting thread...my suggestion is never pick
up the accordion with the stops....if you 'pull' it
out of the case by the stops, or do a jerk with your wrist,
something bad could happen. I always use two hands
to remove it from the case or the left hand strap to carry mine....