Hey Bill,
I should also note that I installed PTFE tubes on the side that the filament goes in. After banging by head at cursing this thing, i went ahead and just removed the PTFE and manually fed the filament like in your instructions. I figured out that you kinda of need to finesse the filament in with a bunch of forward/backward action. Also cutting the filament at a sharp angle and bending it slightly makes them go in.
My question is, is there another way to modify this to be able to use PTFE guides on both sides? Ideally i would like to run my filament from the dry box all the way to the hot end while being "enclosed" just to avoid any issues with moisture, instead of backing out the filaments entirely each time.