Summary

With the new MK5 drive gears and smaller nozzles, the downward pressure has increased and so my old insulator retainers gave in one after another.
This is a simply/quick/easy fix for that.

The baseholes are widened for the bolt heads so you can use the original hex bolts to connect it to the main extruder body.

I know that the newer extruders have already solved this problem but as for me, I want use the old one as long as I can.