Thanks lads, I think I will stick with the barrel I have on at the moment, at least for now. I have no history at all for the machine, it was a mess, so I have no idea about previous treatment. Its just that the replacement I got hold of and fitted is at +060 already so I thought I would make some enquiries about a possible repair. In the picture from Bess near the base of the LH cylinder, there is a distinct line running around, and I have a similar line. On the first pic, mine runs about halfway round and then upwards vertically (downwards when fitted) to the edge on both sides, about on the L-R centre line. It is not clear as it is out of focus but it has a similar look to that of a run of weld. Any idea what this line is? It is only present on one bore.