i made a 5c collet stop with 1/2" UNF all-thread, turned to a shoulder for my need
if you can determine if the 2j's are threaded on the ID, you maybe able to duplicate the idea
maybe an emergency collet could be made or purchased, then modified with the addition of internal threads to provide a surface to make a stop operate from.
I was going to suggest the same thing UMA did until I googled 2J . An expanding arbor to fit the back of the collet would work But might me hard to set exact. What lathe and what is the spindle bore?
Might try making a plug that will slip fit in the end of your collet. Use all-thread or a SHCS and hex nut as a stop. Use loctite to hold the plug in while machining. Good luck with your project.
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