Well, you could be right,

But here is how I can get away with this.

The slide is frictionless using the best linear bearings. The scale used is a very accurate digital scale that will have two different setups, one direct for the smaller and the other setup is with a doubler for the scale.

Of course I will not offer any of these unless I am completely satisfied that it does the job.

It is not going to be cheap either, but like I said, I am doing it for me first.

I'll post pictures once I have something to post.

I have started with some mock up and once satisfied, it will be all machined aluminum with 1" solid steel sliding shafts.

Anyway, will see. I want to be able to test my ZDZ 210 and the coming the Seidel 7 cylinder 180cc engine. That should be interesting.

Roger