They are the fillers for the smoke and fuel.
I have just started using them again and hoping that with some regular oiling they should not stick. I hope so as they are a much neater way of filling liquids..
Ron, Thanks for the compliments on the colour. I kinda guessed you would like it. I am thinking on the next one I might use the same scheme but play around with colours a little.
Regards Al
Thanks Hector.