Trying to identify component

[Busa Grip]

Hello all.

I'm after some help and advice the machining is beyond me I did a broad based engineering apprenticeship but that was 35 years ago Now I'm a vehicle tech and with other goals in life don't think I would buy the equipment to carry out the manufacturing.

The reason for the post is to identify part of the assembly. I thought it would be straight forward however using google I have come up blank.
I would call it a mechanical linear actuator but google does not agree.

Has anyone seen anything like this actuator as a complete part or is it all made from scratch.
I have enclosed a couple of images and a view of the complete test jig. This example was from Russia I did try to buy one from the person but far too many problems made it impossible to finalise a deal.

The full rig is for giving a comparable reading to torsion spring hand grippers.

The other question. Is this sort of item something that someone on this forum would be willing & able to make? I think I can work out all the critical measurements. Just wanted to see about the acturator thing first.

Many Thanks for your time reading
Rob