So in addition to the Robust J-Curve 1" diameter tool rest I got, I felt like I needed one of the Double-S curved ones for more flexibility all around the bowl. I ended up getting one of those $50 ones from China off of ebay, and thought it might be serviceable if I file and smooth it. The post is exactly 1/1000" under-sized for my 1" Laguna banjo, and I can't get it tight no matter what I try , even with the tool-rest tension all the way down. Is there any way I can rig this to work safely? That 1 lousy thousandth of an inch is totally messing up my plan. Anybody else ever deal with this?