Right hopefully this link should work.
http://farm4.static.flickr.com/3066/...dac16a87_o.jpg



The soft earplug is an inspiration Richard .I stuff paper towel up the exhaust but your idea is much better. (And I have some earplugs).
Today I bought some fuel but couldn't get hold of any straight fuel so settled for 5%nitro. People just do not use straight fuel. Oh and guess what the guy in the model shop said, "I have after run oil and it is not expensive" .. So I bought it! It cost me £2.99 for .44 of a pint. (250Ml) But next time I will take your advice and use air drill oil.

Richard.