[Closed] dead rear pivot?

when I was riding last year, the rear end of my bike (cannondale gemini) started developing some play. I swapped the bearings, it was still there, so was advised to get a new rear pivot, as it had probably worn. Fair enough, ordered one from cannondale (in January).

It arrived 2 weeks ago. I fitted it a few days ago (for the first time I'd ridden that bike in a while) and the play is still there. I recon that the play in the worn pivot has probably caused the actual frame to wear a tiny bit (likely??)

so, is there anything suitable for packing the gap, which will take the load forces? i can't think of anything that I can coat the axel with to take up the 'slack' room, but still allow me to get the axel in and out? the gap is probably 1/100mm or something, but its massively magnified because of the length of the back end (where there is 3 or 4mm play)

Any ideas?

H