Fitting RGM front isolastics

I purchased the upgraded vernier isolastics (for a pre-75 ) and am trying to fit the rubber bonded shafts. The rear is easy enough. The trouble with the front Iso's is that the larger rubber donut is 53mm diameter and the tube it has to fit in is 48mm (or equivalent imperial size). I have tried just about everything to squeeze the rubber down to fit but have failed. I know the rubber reduces in size as I have squeezed it down with a hose clamp but even then, it pops out instead of sliding into the rubber greased tube.
Does anyone have a method that works easily.
My next option looks like having to machine up a tapered tube to guide and press it in, but I'm concerned that the rubber might tear away from the bonded shaft in the process.

Maybe being Captain obvious here, have you tried speaking to RGM, my experience is that they are very helpful.

Their is an installation tool that RGM sells, and yes it is basically a tapered tube with a recess at the mount end to make it fit snugly. Use a non petroleum lubricant, like hydraulic brake assembly fluid, silicone grease, etc.
Mike b

What year is the bike? Very early ones had a 3 piece sleeve that is a press fit inside the tube at each end with a floating sleeve trapped between them. This needs to be removed to fit the vernier style.

D

I have use a large throat press to press them in, lubed lightly with silicone lube. thread on the end adjuster, then protect it from the press with a block of 1x4 soft pine. Chock up the iso tube with appropriate blocks to set it square with the throat open at the bottom to clear the iso rubber assy as it exits the bottom.

Start with the proper orientation of the vernier adjuster! Doing it all over because it was backwards, is never fun.

Lube the iso tube well before presenting the rubber assembly.

You have to "help" the large rubber donuts in with tire spoons, as they have smooth edges that will not damage the rubber. One you exert enough pressure to start to dish the large rubbers, then spoon the edges in.

Rubber grease, when you think you have put on enough put the same amount again, ie lots and it will go in, the inside of the mount has to be liberally and totally covered - messy job but easy to by hand, if you have used enough lube!

I did this RGM conversion not that long ago. I used a lot of silicone me grease & a press . Then moved around the edges with a screw driver: it wasn't pretty but it worked.

& without damaging the bonded rubber .

I made the press out of threaded rod.

Do also make sure that there is no paint inside the tubes if you freshened these components up when you had them off. Rubber grease always works for me.

The RGM iso rubbers made the vibrations much worse on one of my bikes.

Changed them after they nearly vibrated the bike to pieces.

I hate doing the same job twice, especially this job, but had no choice.

I went with Andover rubbers, and got my bike back to a very smooth ride.

AN mentioned that they went to a lot of trouble to find a manufacturer who could produce iso rubbers to their "original" spec.

They do take a while to bed in & once they do they are great.

Some people call the RGM product the Atlas Conversion for the first 1000 miles