[stephen low]

Thanks David

Sort of tried this by tapping the flange which rotated it only slightly around with some modest banging.

This told me it the flange is well located however wasn't sure if there was some other internal mechanical link I might be affecting so I stopped.

Did also mildly try the seperation exercise with some screw drivers. There is very limited space to make these fit into gaps and I think the chisel with a finer point will be better.

By my reading there are two steel flange gaskets in place but no great evidence of gasket goo.

Am going past V&A Spiteri's shop later today with the offending bolt sample and some of those photos to talk about all this.

Will let you know what the experts say tonight with luck.

Thanks for the input.

Steve