Well, he's only done it because he's taken out more than 1 spacer. The other article says that the other guy didn't have to do anything for just 1x 2.5mm spacer, other than trimming off the plastic stops on the water sleeve. I would be ok with taking 2x spacers out and removing 2mm of spline. As the article explains, you aren't reducing the amount of spline engagement with the spindle when removing 2 spacers and only shaving 2mm of spline. You'd actually be adding more engagement. +2.5 + 2.5 -2mm = 3mm extra spline engagement.(well, depending on the crank arm model). One problem i see though is that the 2 clamping bolts won't be centered on the spline.
Last edited by tomtomtom123; 08-21-19 at 07:15 PM.