Stretch, that the thing as I remember you said they had all been recently replaced, it looks as if half are from one batch, and half from another.

The head had been stored vertically by me which is why some have probably drained, but it only seems to be the marked ones and the plain ones are still solid.

You said she was a bit tappety after the install and I thought that it may have been the marked ones making the noise.

Not a problem mate as the fact that they were new was a bonus, but I dont want to risk putting the marked ones back in if they are going to rattle.

any experts awake yet

cheers