Help? Problem With Holding The Groove On A Hot Pressing

Thanks,
If adding or subtracting small amounts of weight to/from the headshell changes the cartridge resonance, why wouldn't adding or subtracting some tracking force accomplish the same? The physics must be different?

why wouldn't adding or subtracting some tracking force accomplish the same? The physics must be different?

Yes. Triplanar arms are supplied with counterbalanced weights of different sizes. You can use one or multiple weights with different distances from the pivot bearings- and so effect the effective mass and thus change the mechanical resonance. Weights in the headshell are more effective if you need to lower the resonant frequency, going the other way is why Triplanar makes the multiple counterbalance weights. If using a spring loaded arm you can move the counterbalance weight and set the spring differently, but the scale on the arm won't be correct anymore- so you have to use a cartridge tracking weight scale to know if you're at the right tracking pressure.

When you change the "weight" of the needle in the groove you are not changing the mass so the resonance frequency stays the same. It is very common to confuse weight with mass. Your tonearm has the same mass in outer space but it has no weight! 
When adjusting the mass of your tonearm system you are trying to get the resonance above record warp frequency (about 3 Hz) and below the lowest frequency recorded on the record around 18 Hz. 10-11 Hz puts you right in the middle. My records have been stored upright under pressure for decades so I very few warped discs plus my SOTA Cosmos sucks them right down so I try to keep the resonance frequency even lower 7-8 Hz. I think this improves the Bass but frankly I have not been able to AB this so it might be psychological:) What I can state as a fact is that if you let it run to high over 18 Hz you will destroy your bass, possibly feedback and send your tonearm skyward. I once knew someone who installed a Koetsu in a Transcriptors Vestigial tonearm and he wanted to know why his tonearm would not stay on the record!