Nick
I think the holes do go oval with wear.
Our method was first to clean out the holes wire brush on drill, whilst letting the bushes soak in very hot water.
liberal amounts of "squeaky" applied, first we put the metal inserts into the bush, but not more than half way, then we select a range of sockets
1. one socket sized so it pushed on the bush and not the metal insert
2. one socket so it pushed on the metal insert and not the bush
3. one socket the diameter of the hole on the wish bone so it let the bush come thru.
Insert wish bone into bench vice (big) placing socket 3 at the back (in the vice) and by alternating sockets 1 & 2 on the front face (in the vice) start to press them home repositioning the whole shooting match as you go.
You need a second hand with this it is almost impossible to do single handed.
Quite hard to explain but hope that helps.
You have already put into action the final plan, give up and drink bear and come back to it later.
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