A new quick fix for a horrible old problem...
Step 1: Curse loudly after breaking off an insert fin or two.
Step 2: Locate nearest T-rubber and contemplate the possibilities.
Step 3: Use a fresh Xacto knife to cut it to the exact length of the star nib.
Step 4: Superglue the rubber to the underside of the switch blade. Look through the hole and center it on the wear mark.
Step 5: As long as at least one insert fin remains, the star's movement will remain centered.
Step 6: Be more careful next time.