So now the upper deck is trimmed to accept the wrap around. This is my new method off the cuff. Since having a Quooker tap fitted I see this as useful for more than hot drinks
The inner pipe is the radius I require and the outer half pipe prevents the outer skin splitting.
Two or three dowsings then tied and left to dry.
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Still damp but it now has no resistance and no splitting. I will give it a second treatment to be sure.
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As this is a lot of work to cut out it would be folly to cut it first and then form the bend.
More later....