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Romy the Cat wrote:

OK, the chamber is wood, very solid wood, the space felling is hard-solidifying construction foam. What material to use to make displacement plug? Let presume it will be 8”-1O”. Aluminum will be nice but I am afraid that if I do a high quality, very tight machine threads on it then it will ne hold on Aluminum. Steel of course will be the best and it is my leading chose but I am a bit worry that speed of sound across steel is too different then across the surrounding wood. The plastics are wonderful from this perspective and some of them are very hard and will maintain the threads very well. I was looking at McMaster-Carr catalog – they do have some very nice rods but the price is too high. For 10” rod of G10 for instance they want around $700, and I need two of them, too much for THE purpose.

So, I will most likely go for steel plug with application of some treatment to the surface of the steel, perhaps cork or the similar. I mish spray some red “Great Staff” over the surface of the steel plug to make it very uneven and jagged. I do not think that at LF it will make a lot of difference but as Russians use to say: you can’t spoil mashed potato with butter….

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