Filament pressure tab replacement

I do not know the correct name for this part, sorry… After about 1800 hours on the Taz5 since last July, I started getting some slip on the filament pressure tab, I thought it might be due to the radius on the bottom of the Lulz stock tab getting worn. I felt like I was tightening the screw way too tight, more and more. So I whipped it up in Catia, this is square on the edges, seems to hold solid again, it may help. I also uploaded here:
lulz_filament_guide.stl (118 KB)