I did not get as much done to this today as i would have liked ,, i had a few other small projects to get out of the way :dremel: ,,,,,, milled up the edges of the block as i had just left them ruff sawn as the job was gripped in the four jaw for turning .
now it fits into the knee.
turned up a gauge from a bit scrap bar , to gauge the fit between the lugs .
Not a bad finish on that bit of "scrap bar"
I cant remember a cylindrical grinder in your shop
I don't think you will have any problems with flex on that block
John