Its possible to change brush position to change speed, but that's a lot of work and engineering and some machine work to accomplish in my opinion. Its already pretty crowded inside the brush area on the starter.
To reduce the hard engage you get when you apply 12 volts to a 6 volt starter you could use a smaller wimpy battery, say a 500 CCA or less battery instead of a 700 to 900 etc. Also if you use maybe 4 gauge cables instead of say 2 or 0 etc that can soften the impact. Usually a 6 volt starter with 12 volts applied spins plenty fast so I don't think a lighter battery and smaller cables will prevent a good start.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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