I want to replace the rubber handlebar riser inserts on my ‘77 fxe triple clamp with solid mount adaptors. Q— do I need to drive the rubber inserts out of the triple clamp before installing the solid mount spacers or do they mount over the rubber inserts? If they need to come out, do they come out fairly easily or are they a pita to remove?

I’m installing Flanders - type risers which have rubber inserts integrated into the offset portion of the riser to compensate for the solid mounting to the triple tree. Right now, the rubber on both the mount and riser makes for a fair amount of play in the handlebars.