clearthinker
everything's relative.
your example: .4g extra on 2.5g is +16%
1. 2M Black specs say track at 1.4 to 1.7g.
2.9 g is +1.2g, which is +71% of OEM's max tracking force.
Something else is wrong if this extra 71% is needed.
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Not only more wear on it's expensive Shibata tip, and more wear on the grooves: it must be restricting the proper movement without and within.
the suspension/compliance/magnet movement within the body are in no way close to their design parameters.
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Cantilever Material? Ortofon info does not mention it. I found a 2M LVB 250 upgrade that has Boron. I therefore 'presume' 2M Black is Aluminum.
It won't take much time for that aluminum cantilever to deflect from the extra weight, becoming a 'low rider', WRONG VTA will result.
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His entire TT setup needs to be re-evaluated. TT Deck level? Platter Level to Deck; Arm properly mounted: proper Spindle to Pivot, parallel/perpendicular to the deck/platter.
Cartridge: overhang, two null points alignment, proper cartridge tightening; Arm height (parallel to LP when in the groove. Azimuth from Front, VTA from side when in he groove. Now factory tracking force; now anti-skate.
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This is exactly why I recommend everybody acquire the simple tools, and practice setup until they find it is not as hard as anticipated. Or make friends with someone nearby; or pay someone to set it up in your home.
Where does your friend live? Perhaps a member here lives nearby. Anywhere near Plainfield, NJ?