I've found tons of LV twinscrew threads but cant seem to find what I'm looking for. I know you need a minimum 6" tall jaw height, but what are you using? Right now I'm planning a 4" workbench top that would need a minimum 8-1/8" tall jaw if I'm doing the math correctly and give me a throat depth of about 4-1/2". For some reason this sounds pretty tall and I'm wondering about thinning out 2 channels underneath the top for the screws (maybe down to 3"). What's everybody else using?