Great post, you really show how to do it. Thorough and with pictures.

I ride with size 13W boots so I need something like this. That's year-round for me. I'm probably a 12 or 12.5 foot but I use custom orthotics in my shoes so I need the bigger size.

I've read that MKS clips come in two sizes, including a bigger one with some vertical depth to make room for bigger shoes. Is that what the MKS L is? For some reason I thought they called that size XL. Maybe I'm not remembering that right.

I'm also using pedal extenders. I'm having a problem because the extender diameter raises it above the top of the pedal, meaning a lug of my boot can sometimes ride on that and make my foot pivot around that high point. One side of my pedal is taller than the other, and it only happens on the shorter side.

I've been expecting to cut a wood block and drill it to do the same thing you're doing with plastic tubes.