Most would say an unmodified machine would be best.
For polishing in tighter areas only maybe just the mini, but the slightly larger shroud of the Duetto really shouldn't limit you too much. A 4" at the face pad will extend just to, or slightly past the larger shroud.
They are almost the same machine all the way up to the most of the head. Same throw, same power, and mostly the same parts. Smaller shroud, lighter counterweight and BP on the mini and I guess a different tune from factory.
I must note I do not have the Kamikaze BP yet. Just a stock mini BP that I thought about trying to modify to work with my Duetto. Not really a safe thing to try.
If AG carried Kamikaze, I would have already ordered one.
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"The more answers I seek, the more questions I find."
As shown in dlc95's post above the counterweights are different between the two tools. This is to offset the pad size at the 12mm orbit and minimize vibration.
People got accustomed to simply swapping plates and pads with the PC and similar tools. They vibrated in pretty much any configuration so it was no big deal and the stroke wasn't such that balance was as imperative.
With 12mm of stroke and the balance built into the machine you'd be undoing one of the primary reasons for choosing RUPES for a large orbit tool.
Not saying YOU CAN'T mod, but there are reasons the tools exist as separate part numbers in different configurations.
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