It was wonderful to see so many of you take this opportunity to chalk up a hit on both sides of the casting/forging issue, but as MotorQ summarized in the end, you weren't really answering his question albeit it was not precisely stated in the first place. I believe that Groberts answered the...
Hi.... I see that this is an old thread but I will make a couple comments anyway. Not all buna's / Vitons etc are equal. There are low-temp buna compounds that are capable of retaining some elasticity until -67 Deg.C. Are you using the LT version? Is it possible for you to not chill the shaft...