Hi All, Just done the mod to throttle, definately helped with jerkiness at low openings, I have my co adjusted up to 40 on the dash settings. Don't know if this is ok but seems to be lts better. Started at 15 and worked up with road testing each adjustment. Just to say I did mine easily with throttle in situ using a dremel with small rotary file. Just held Dremel still and rotated throttle. Just saves a bit of time thats all.