I am having the most annoying trouble fitting a poweflex bush into a wishbone, the bush is in two halves with a hollow metal rod that goes through the middle. No matter what i do every time i press the metal rod into the bushes (using a press) one of the bushes pops out about 5mm when i release the pressure. If i clamp the bottom bush in the press it just pushes the top one out. Im going out my mind, i have tried a million combinations of fitting them

any ideas?