Hi Wim
Thanks for the comments. if the deformation isn’t present in Rhino 6/7 I’ll properly just have to upgrade.
Regarding the cosmetic threads. The main projekt moves around to other people aswell, so there needs to be a indication on where the threads are being processed. I cant remove them completely. But as long as its just “cosmetic” Ill work around it.
Of course it would be optimal if the glitch wasn’t there 
Again thanks for the help.