I'm building an amateur sporter 7.7 rifle now out of some dead parts from past endeavors.
I'm impressed by the way the knob was altered just because of the lack of being able to tell how it was done.
To me it looks like it was somehow manufactured that way from an amateur perspective but does have what looks like a lengthened handle section and has been been bent by having heat applied but not sure. I don't see any tool marks which are hard to hide and the grasping ball looks pretty round.
Hard to make an alteration without evidence of how it was worked from a beginners viewpoint. Interesting for sure.
Attachment 92352