Oil sight tube leaking again.

Well the oil sight tube has split yet again,virtually a carbon copy of the last one. It split top and bottom on the banjo spigot,my first one lasted 8500 mile's and this one only 4000 miles as i'm now out of warranty i had to fork out £ 10.90p for it along with the 4 copper gaskets.

I've got the old one a least so i'm gonna take a trip to an aircraft model shop (remote control type) and see what tubing they've got.