i have think about this already, but before i don like the DIRECT DRIVE ROTARY, now a friend of mine give me one for try and i like, DIRECT DRIVE are very smooth, good

maybe are not the best becouse the needles still move to much on side when they run, i think linear ROTARY are more perfect, but DIRECT DRIVE are good, sure....

but for put PIVOT RUBBER in DIRECT DRIVE sound complicate, becouse need a big bearing where the PIVOT can place inside, sound like become to big the CAM DRIVE

ihere on the forum have a builder , i forget the name, him have done the first DIRECT DRIVE i ever see with GIVE, him split the frame in 2 parts connected by classic SPRING.... GENIUS.....