Commandos were a stop gap expedient only design to Norton till coming out with hi end rotary cycles so various items must be considered as consumables, like tires and cables. If is not cost-effort effective to try to repair a KS distorted splines as once splines giving trouble to stay stable with whimpy factory clamp - ya never get it to stay stable beyond a few kick offs and repeated attempts will just distort kicker splines worse or even get trapped on shaft splines which distorts shaft splines that are more serious efforts to replace.
On next lever open gap up double factroy width, grind-saw-file off 2-3 splines either side of gap then drill through lever to fit grade 8 bolt and nut to extend stability significantly but will still eventually work loose again - even if Cdo so well tuned it always starts with w/o a kick, just a step down or even by hand, ugh.
I've been through this enough now, next time in addition to above mod will use low temp fast set JBW epoxy on outer shaft splines and heat up till soft and hole expanded to work off against gooy resistance instead of shearing hardened metal splines to remove.
Really clever owner would mod-grind back side of lever and modify/create a puller for this special use but I'm not to that level yet.