MSS Mamod Loco Spares - Sight Glass & O Ring with Rivets

Easy to replace, but didn't know about the film on both sides (should have read the website first)

The kit arrived promptly, no instructions, I installed the kit and fired up the boiler, after a few minutes it suddenly started leaking again. After phoning Dream Team it appears the plastic sight glass has a productive film on each side that has to be removed!!!.?. On asking why no mention of this film was highlighted on the packet or web site I was told that if I looked on the website I would have found the instructions for building a locomotive where buried in the text it says to remove the film before installing the sight glass. Very obvious place to look.