I forgot to tell you. Air leaks are another trouble.......I finished using a very light film of silicone compound between the power cylinder and mount, and in both sides of the cold end.
Check this post in another forum, you might find some information.
http://www.homemodelenginemachinist.com/showthread.php?t=14891
Check this post in another forum, you might find some information.
http://www.homemodelenginemachinist.com/showthread.php?t=14891