Well the tubing was a no go......the Nitrile solid rubber cord which you have to push inside the Acrylic tubing to stop kinking was too thick.....i ordered 12mm for my 12mm id tubing but after speaking to another supplier there is apparently a thickness tolerance of 0.65mm either way which is the problem.....normally being a tight fit is usually a good thing in other types of insertions ....but in this case it is not.
I managed to get it in about 4" after about 10 minutes using warm soapy water then wd40, then it just wouldn't budge at all.
I have had to order 11mm Cord from another supplier and hope that does the job.
In the mean time i decided to do something else after wasting my time with the tubing episode.
I was going to spray paint my GPU alloy cover but decided to go down the vinyl route for when i come to sell it on.... it will be the original colour so as to not effect resale value.
I also Primed up the PSU fanguard and pcie slots ready for painting.