Ortofon LH-2000 weight 15.5g and the detachable SME head shell come with 3009II weight 6.4g, that could be why you can't balance the arm, A heavier counter weight or lighter head shell may solve the problem.
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OP I use the same setup. I also use the 3012 on another 124 I have.
Make sure everything is correct from the rebuild (including the tonearm)
Get the right counterweight, it is as simple as that.. There is more than one setup. I've seen a few mods on SMEs, nothing is carved in stone..
Add the weight you need on the counter weight and weigh it.. Look for the combo of weights that work..
BTW the CW doesn't have to be pretty to work, just stable and won't move unless you want it to move..