hi all, fisrt thing, this mod is only if you have ur Z exstrusion not straight, I've discovered that mine was about 7-10 degrees angled , so every print I was making was crooked, sad thing I've dioscovered it late after many prints, cose the problem was on the side so not easy to see looking front print.
other sad news is the little exstrusion part and also the long where not cutted properly, so I've decided to make a base to insert the exstrusion in order to keep it straight, u can see the about 0.8mm difference on one side from the photoes.
print it hard so about 60-80% infill, better petg or abs cose is near the bed, but also pla with such infill can stand the temps.
for the 8# m4 tnuts, 2# m4 10mm bolts, 1# m4 15mm bolts,5# m4 20mm bolts, also m4 washers will help in strenght.
stock parts: u will have to use about only one m5 standard nut on the back plate, it's ur choice on where to use, if one under the exstusion or the one in the middle, if u use 2 udner the exstrusion this mod is useless meaning u have a good cutted part.
NOTICE: u will lose 1,5-2cm in height
first photo is from the first model, new one is better