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RE: Wally Tractor Universal... is it worth it?

The arc protractor is a great solution, but requires that you have the pivot/Spindle distance and other parameters known to a high degree of accuracy otherwise you will be going around in circles wondering why you can't perfectly track the arc or simulataneusly achieve the expected nulls.
The other problem with the arc protracter is to ensure that the orientation is correct and fixed i.e the pivot stylus line is pointing at exactly the pivot centre. Otherwise you are trying to adjust overhang with a moving target.
If you really don't object to spend the amount you quoted, a better solution would be say the Feickert or Pro-Ject Align It. Using the Technics SL1200 as an example, even though the Pivot_stylus distance is meant to be 215mm, there are going to be small errors in this figure (as I recently established with my decks) which mean that you never perfectly follow the arc on an arc protracter. So the Linear Offset type jigs solve the problem.

These designs have a trammel which you position over the pivot centre. The linear offset is predetermined so by positioning the trammel tip, you automatically fix the position of the inner null so you can adjust overhang and offset with a reduced number of variables.
The ProJect allows you to adjust the linear offset within a limited range defined by their arm range so the inner null can be 63, 66.1 or I forget the innermost one (I think it is 60).
It has some faults - notably the lack of a proper grid around the nulls. However, I drew up my grid in FreeCAD and placed my sheet over the so that it is a non-issue for me.
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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