Prusa MK3 Filament Spool Bowden Tube

I was unhappy with the spool jiggling the frame and nozzle height during printing so I finally finished my spool Bowden tube adapter. I found the spool holder out on Thingiverse and also modified the LH TOP Z-axis bracket to incorporate the tube holder and adapter(A). I used a section of what I believe to be Polyurethane tubing 1/4 inch O.D. - .160" I.D. (leftover from a RO drinking water filter install, McMaster Carr 5648K25) which seems to be slippery enough for the filament to slide thru or g