Cross-threaded dynafit spring barrel

In general Dynafit bindings need taken apart and put together with kid gloves.
Don't give that last Jersey Joe twist to make sure it's on good and tight because the plastic parts are going to strip or the screws snap. Just put everything in snug and call it good. Even if you are increasing the tension of the DIN and peg it out just go till its stops because the screws are easy to strip.

Also, if you do decide to buy a plastic heel unit housing (and just the housing), then transferring over all the little parts is getting into pretty advanced Dynafitting.

Advanced in that you have to take the entire binding apart except for the baseplate/post to install a new housing, but not really complicated if you are somewhat mechanically inclined. Don't forget to grease the pivot post and spring when re-assembling.

No word back yet from Sarah...

Have sent messages to local shops seeing if there are any spare heel posts lying around for sale. I'd prefere to just buy the complete heel post and not monkey with anything else.

And I appreciate all the advice about how careful one needs to be with that poorly designed thread system, but keep in mind that I was aware of the potential problems there, and in this case, there was no avoiding it.

And I appreciate all the advice about how careful one needs to be with that poorly designed thread system, but keep in mind that I was aware of the potential problems there, and in this case, there was no avoiding it.

I can see how that could be viewed as a design flaw, I would not call it poorly designed, just a very minimal (tight) tolerance for error. It really has to be considering the load it is compressing with plastic threads. So I think it is magnificent engineering. Also the spring at times may not seat completely, so I make sure that all parts are in order before the 1st twist of the main screw is made.  Patience is a virtue working with these bindings!

Not really looking to debate the engineering of dynafits with this post, but the plastic threads are the design flaw.  Especially with a fine threaded female insert made of metal.  It's obviously a problem, as most people struggle with that connection.  I spent 2 hours trying to hand thread the connection with all the tricks in the book, so lack of patience wasn't really the problem here.

Not really looking to debate the engineering of dynafits with this post, but the plastic threads are the design flaw.  Especially with a fine threaded female insert made of metal.  It's obviously a problem, as most people struggle with that connection.  I spent 2 hours trying to hand thread the connection with all the tricks in the book, so lack of patience wasn't really the problem here.

Sorry, my response was not intended to get you worked up in a lather. I can understand your frustration. Once it's cross thread damaged its time to move on, all the patience in the world is not going to bring it back from the dead. Unless someone here has a solution to tapping the heel piece.
I wonder where are you expecting this thread to go if you question the design flaw, but don't want to discuss the engineering?
Sounds like upper management to me :