Used to do the alcohol trick with BMX grips back in the 70s. You could also use old school hair spray if you were really quick about it. Once it dried it kind of turned to glue.I saw on a post about BMW motorcycles that when you are dealing with inserting rubber on or in something, you can douse it in isopropyl alcohol and that will make the rubber slippery for just a few moments and then it evaporates. I've done it with the rubber fuel sender flange in a Volvo and it worked like a charm. I can't say if it will work in this instance, but it's a good tip to keep in mind.
Also an engineer friend of mine told me of a product they used to put the hand grips on treadmills that was kind of like snot, but then in short order would dry out and lock the grips in place. I don't remember the name though, I'll have to ask him.
This is a great lubricant for any rubber component as it is vegetable based and won't cause deterioration of the material. Use for all brake component rebuilds, the o-ring for the fuel sender in the gas tank, pulling wires through a rubber grommet, ...Red rubber caliper grease
Fabricated the “Ian C” installation tool to pull the bushing into the sleeve. Once 1/2 way in, I hit it with a 2lb hammer and, with the lubes suggested by others, it popped in into place.