Super Six Idle Issues... Bit 'O' Help Please!

My description is generic and applies to all carbs from roto-tillers to 4-bbls.
Well on tillers you don't find T-slots nor pairs, but the result is the same; The worn-out business leads to a throttle-valve parking problem relative to the low-speed circuit discharge holes or slots. This parking problem is particularly troublesome on small engines with single barrels or old 2-stroke snowmobiles when someone tries to idle them down......... because they might be running too fast.... for whatever reason....lol. A 2bbl is just two singles ,side by side, sharing a common fuelbowl. and usually but not always,also sharing a throttle shaft.
A lot of base-plate wear stems from the angle the cable is pulling from, in combination with where the return spring is anchored to, as well as the power in that return spring. I mitigate this with a two-stage/two spring system,and whenever possible, having the spring anchor, the pivot arm, and the pull-cable in as direct a line as possible. I set my first stage to my cruising speed, and hardly ever use the second stage spring. I get away with that cuz I live on a prairie with about the same elevation for several hundred miles in any direction,lol.