Yes, that is the good news - that the compression fitting works, and if the problem relates to thermal stress, there is an easy way to fix that also.
To minimize thermal stress – the heater wire could be “feathered in” from both ends, when it is wound so that there is an intermediate zone of heat which is less than the fully wound wire, but greater than the unheated zone. The idea is to spread out the areas of highest temperature gradient, to reduce thermal stress. From: Bob Higgins <mailto:[email protected]> Ryan Hunt reports that the failure mode was NOT the compression fitting giving way under pressure - the fitting remained intact. This experiment was of the "easier Parkhomov" design, posted previously where the seal was made with a compression fitting, in this case with the use of a soft aluminum ferrule at the suggestion of Alan Goldwater. Alan's tests suggested the compression fitting would hold and it did! \
