Who makes the best brass cutting jig for the harbor freight shop saw?

I am getting into reloading the 7.62x40 WT and I may do 300 BLK as well in the future if I ever get a suppressor. I bought the harbor freight mini chop saw that most people use of removing large amounts of brass for 300 blk before fine tuning with a normal case trimmer and now I need to buy the jig and am looking for recommendations. I would prefer something that is easily adjustable via a screw or something so that I can use the same jig for 7.62x40wt and 300 blk. what are your guy's experience with the various jigs on the market? Thanks