Is this normal?

[Big Bob]

On my Colchester 13 x 36 roundhead with L0, I just use a piece of bent wire about 1/8 inch diameter that I put on from the top and with the wire on each side then unscrew the threaded holder with the large wrench and the collet holder comes off.
Bob

 

[Coomba]

On my Colchester 13 x 36 roundhead with L0, I just use a piece of bent wire about 1/8 inch diameter that I put on from the top and with the wire on each side then unscrew the threaded holder with the large wrench and the collet holder comes off.
Bob

Well, you know I wasn't smart enough to take a picture of this wrench, before I cut it up, made it longer,and changed it to a hindged type,with a pin. Maybe now that I have a tool to loosen the collar, it will come off better.