I just did like my dozenth time of fitting kick lever to a '72 Combat with upgraded bearing and no gaskets. Best I can understand you inquiry, nothing you do inside gearbox should effect the fit of exterior kick lever on lay shaft splines. I saw wider my kicker clamp slot for better grip but still had to drive wedge in to open enough to remove fighting it on, once aligned easy tapped full on spline seating. Nipped up by through bolt with part of bolt head ground off flat to snug up under the kicker curve, nut on exposed opposite flat. Solid so far as any I've felt but ain't put a boot to her yet either but hand tests engages.