MSC industrial Supply has a 7/16 t-slot clamp kit which will fit the Novakon NM-145 mill.
Sorry, I misplaced the part number--you can search their site online to get it.
:cheers:

They have a sale promotion valid through Dec. 31 with promo code MWFFDEC.

The price is 69.99 and free shipping during the promotion, for a total order weight of less than 20 pounds.

Please note that the special price requires special part numbers, otherwise you will pay the non-discounted prices!

Here it is:
52 pc combo step block and clamp set, Import, 3/8-16 stud size, 7/16" slot, 11/16 nut width, Order number MB06944466