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well I tried the jb weld and boy do the clearances change with any amount of heat so that wont work. I found some brass tubes that are very close fit with each other so I will see if they will work for piston and cylinders. A friend of mine who owns a jetski shop has a few sleeves from the air pumps...

Thanks for the info. The JB Weld says it will hold up to 600 f but I dont know if the expantion of the brass and jb weld are similar enough to seal good.

Yes please Ian S C. I am constantly on the look out for more info. I am in the process of building my next stirling engine . the first one I tried failed for the typical reasons ( too much friction leakage and weight ) . I'm hoping this one will work it is an alpha were as my first one was a gamma. ...

This is my first post . I have a few questions . Why aren't there more model alpha stirling engines like there are gamma stirlings ? Why are diaphragms not more commonly used at least in models ? Can or has an LTD alpha sirling be designed ?