Originally Posted by fietsbob
I read both revues*, not mentioned right crank arm is it cast or cold forged..
Thanks for the interesting question.
According to Wiktor/efneo the right crank arm is forged, the SGS certificate (= proof of passed industry test) can be found here:
http://efneo.com/filesss/SGS-crank-cert.pdf
Originally Posted by fietsbob
*Nor did Efneo reply when I asked directly...
That's very odd for my experience and I'd really recommend to check the used mail address AND trying to send your message from a different mail account (I guess you just ended up into some mad mail-filters).
During the installation of two drives I've learned to know the brilliant support of the efneo brothers,
I've got precise and appropriate reply to each single question, usually within a short time, either from Franek (Franciszek) or Wiktor.
Never before I've experienced such a helpful and skilled support at any company; we've exchanged over 160 mails within about two years.
Therefore, my advice for noisy drives - get in touch with the efneo bros asap!