I’m assuming that you have tried and the rubber insert does not move.
If it doesn’t, try finding a toggle bolt that will fit thru hole left by the bolt. Possibility a 1/8″ and a bolt long enough to get the toggle past the rubber insert. Put a fender washer on the bolt, push the toggle all the way past rubber, then tighten the bolt to pull the rubber. A little WD40 to start with, probably would help.
LAD Specialties customer / tony kart / rotax / kt100