Broke the pegs on the bottom of my gas cap
tumbler so that the key just spun in the cap.

Luckily I was able to extract the key and tumbler
from the cap (helps to be 2 blocks from home)
and get the gas cap open to extract the guts. I used
some needlenose pliers to turn the tumbler mating
surface CCW just enough (whew).

I had a fairly new cap assy lying around and am using it
but I want to rekey the new tumbler to use the
old key but I can't see how to disassemble the tumblers
and get the pins out. Any tips appreciated