I can not find any info on the website. There is a small flat on the ring which says lock. There are two small shallow holes on opposite ends. Underneath I can see one Allan head that is not accessible because it is under square part of the head. I wonder if I cut ab aloen key if I could get in there. Hmm.
On a side note.
I can't use the boring head as it is as I don't have a way to hold it.
Against the advice of others I cut the shank down to a stub. I have a pair of split R8 collets so i used one to hold it in the mill.
Originally I was going to turn down the shank to use in a 7/8" R8 collet but I realized the collet only grabs on about 3/4" so decided to just chop it off.
I put a Borite bar I have and tried it out, just checking run-out. No matter how many adjustments I made could not get less than .005" TIR.
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