Homemade Stirling Watts Beam Engine, Hot Air Engine

Hi, This is my home made Stirling Watts Beam Engine. Its the third engine that i have built so far and the one that s taken the longest at nearly 6 months. A lot of the time was spent staring at it during the build wondering how to make the ideas in my head a reality. There is a slight tap coming from the linkage i have fabricated that needs to be fixed, but other than that its almost silent. The displacer cylinder gave me some problems when it was first run before painting, i had to have a very la