Nobody uses them?
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Rosedanny; a relatively simple way to determine which weight of screw to use can be found at VinylEngine.com...
You need to know the effective mass of the tonearm and the weight and compliance of the cartridge in order to use the chart. Simply combine the weight of the screws with the cartridge weight and compare with the compliance of the cartridge. You can select the screw weight(s) that are within the recommended range of cartridge resonances.
If you don't have access to the values needed to use the chart you can find tonearm effective mass, cartridge wieght, and compliance in the VinylEngine.com databases...
Otherwise, just experiment and listen. Start with the lighter screws and work your way up.
Nothing negative; that's unless you mess up and don't adjust VTF after installing a high compliance cartridge or one with a fragile suspension using the heavy brass (6.2g) or stainless (5.8g) screws. That extra weight/force might damage the suspension. Maybe.
I've been using EZ-Mount screws to control resonance (low effective mass tonearm with a lightweight cartridge) and they work great.