Want a very cheap and easy way to measure mod resistance?
This has to be the cheapest and easiest if you have a decent soldering iron and an old carto: just solder the positive to the negative then sand through to the brass of the positive, plenty of flux flood the centre at first then run the solder around the centre sealing the gap. As accurate as the solid copper rod and more stable so easier to use, remember to set the mod res to zero before testing!
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It don't get much cheaper than that.
Great idea....but where the hell did you find a carto?!....unloaded them all a couple years ago...