Side adjustment rest

[paul s]

Can anybody tell me where this kind of adjustment is coming from?
Or who made this adjustment?
Hope somebody can help me out.

ET

 

[Travelor]

Looks like a camera attachment, but.........

 

[Tcon]

It is a Flexable Drive Shaft

It is a Flexable Drive Shaft attached to a standard windage top and a home made bracket. Like these located here

http://www.mcmaster.com/#flexible-drive-shaft-connectors/=tznpe