trackless cost is the metric i didn't know i needed. this was fun to optimize. i had a 120g solve with two piston arms that i thought was good, but then i realized i could use only one piston arm and save 20g. arm 1 does all the heavy lifting, but i really like what arm 2 does; especially how it helps arm 1 dodge atoms so it doesn't have to retract. i can't prove that cheaper is impossible, but i certainly won't find it.