KH Cranks 150mm -> 125/150mm

Is it possible to make another “hole” in 150mm KH cranks?
Will it be ok if i just “make” another screw thread or i must make a Cr-Mo socket?

you mean to do it yourself? then yea, you can. read this.
if you don’t want to do all that work you can just buy a set of 150s/125s.

Thanks (or maybe Dziekuje,skoro masz Polskiego orzełka:-))
The link to the photos wont load but i mailed the guy who did this custom cranks so ill have the details