its not that the knurls aren't available, just that MSC's online catalog PO'ed me the other night. all I have to do is call em up and tell em what I want and 39.95 later they are in the mail. but due to bills I have to wait till I get my check in January to order them.

I would of made the slots to of taken 5/8 shanks which would of been easy to of gotten a 3/8 wide roller into, but with all the things that happen with a casting I figured that a half inch deep slot was at the max, which doesn't leave a lot of room for putting pins into a .5 wide shake with a .25 slot in it.

there are several options that are available to me, one I can slot the frame ends and use 1/2 X 5/8 shanks which will allow the wider rollers but then I will have to cut a recess in the frame for the wider diameter roller to fit into so the full 2" opening is available to inserting round stock into.

almost forgot I have three sets of metric rolls that have 5.5MM pin holes in them that are like 14MM in diameter and a bit wider then the 1/4 inch slot now I could make new bars to fit them, but (there is always one) where in Oklahoma do I find metric dowel pins. and for me to make them I'm gonna have to borrow Bob's bright and shiny finish camera, it's one of them kind of things I'm danged if I do and danged if I don't, but I will get rolls in it that will fit just like the store bought one. cause it had the same .5 rolls in it. anyway the one listed on MSC does, not sure about Tom's