OK, so I've got the piece I'm going to use. I throw it in my 7x12, support the end with the live center, 'cause it's eventually going to have a sidewall of about 0.035"
Pic #1 and #2 show turning the outside down to the 0.910" dimension.
Pic #3 shows the black lamp tube sliding over the new piece. It was hard to get on, and the internal threads grabbed trying to get it off. I had a heck of a time, so it should be good.
Pic #4 shows parting off the new piece. Note the old drill bit used to catch it when it parts off.