Hi Natlek. Not too much, ask away. ;-) I purchased the holder from Tormek. Here's an exploded view at some webpage. > https://advanced-machinery.myshopif...rts-for-svm-45-svm-100-and-svm-140-knife-jigs If it was less fat I could grind shallower angles. The minimum angle on the blades I've used it on is around 18 degrees +- unless I shorten the pipe to use the bottom of the platen to gain the clearance from the clamp. I don't need to do that for my use. I unscrewed the rear knob that came with it, off the threaded section and stuck it in a piece of copper pipe. It works very well with 400 grit and raises a burr quickly with low pressure and slow belt speeds.