Brass annealing hardness - scratch test?

[jasper2408]

ordered a w-20b.

You needed the W-20. The 20b has an opening size of 8mm from the probe to the rod which is too far and won't touch the brass as the neck metal is not thick enough. I ordered the w-20 which has 6mm for the opening size and then had to grind the 10mm rod down on 3 sides to fit my 223 cases. The fellow that I got the idea from on Utube had to grind down the rod also.

The first Starline necks I tested were 13 new and once I resized them or turned them they went to 17. To get the fired case neck back to 12 took 3.6sec on my Benchsource annealer using both torches.

I got the below chart off Amazon so you can see the different opening sizes on each tester.

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