much MUCH easier is high speed gears (SHS 13:1) with high torque motor (ACM Neo). it'll pull the M120 you're after no problem.
VVD's need very hard springs to work though, especially on the full open position, pretty much to the point as you might as well just get another gun. you'd basically be smacking an M150 with zero compression, not to mention you'd have to remove the (mostly metal) second tooth.
also DSG's probably are the single most challenging thing to do. ASM is the place to go if you want to learn more. (especially since the guy who makes them and the most experienced DSG techs reside there)
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too busy tinkering to play.
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