you mean these:
Not an easy job, here is what I did: microwave a pan of very hot water and place bushing in water. place end of link in hot water also.
lay a towel or something on counter, with an object like a large flat blade screw driver (large b/c you don't want the object to be sharp).
Push as much of the bushing in the link, apply extra pressure with flat edge of screw driver or like object. It helps if you have three hands.
They will eventually pop in. the part that initially didn't want to go in maybe a bit deflected, if needed encourage it to return to the original shape. return to hot water for a few minutes if needed.
They should all be good when your done.
a small C clamp may be the ticket...why didn't I think of that?