Hi Ozzy,
You could try moving them out cold as Bonzo suggests. Try using some 16mm studding to go through both bush tubes, place a large washer between nut and bush tube and gently screw the nuts out evenly both ends.
I used this method on mine before completely welding them (gave them a few turns to out on the nuts to pre stress them by about 3-4mm as I knew they would pull when welded).
You may gain a bit hopefully.
Johno
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