They are supposed to be a tight fit Tatey, the bush tube is 33.7 x 2.6mm ERW with the weld left on the inside. They should be left tight so that the bones do not rotate on the bushes but on the crush tubes instead - the weld helps to hold them in place.
If you use some 120grit paper and taper the leading edge of the bushes then push them in with the vice, making sure to keep them square. Push in 1 side at a time. Put some copper slip or silicone grease on the crush tubes, then push these in with the vice. Once you've pushed them all the way through with the vice, clamp it up tight and you will be able to rotate the bone on the crush tube. Do this with all and you will be fine.
You want them tight so that there is no play in the bushes, leading to poor feedback / handling and wear. Once all the bones are fitted the leverage on the bushes will move them nice and freely.
All the Best.....AndyH
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