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The black plastic undercarriage or adjuster plate was only on the last couple years. I am not a big fan of them looks wise, but work fine.

As far as the slim handle replacement, I think you could swap in another slim handle for parts but I haven't seen anyone do a new handle. The TTO mechanism is integrated into the handle itself.

I have pulled apart a few of the BBs and find that the handles are a very light non-ferrous metal.. I think it is aluminum but it could be another alloy. I have heard that it is a 2 part paint that...