No problem Ben, I have been using them for years without problem. I don't know Kaz, and I don't doubt his word a bit, but if you know Caffeenman, you'll know that he creates superior airplanes. If he can trust it, (as I do) you need not worry.

Try this:

1 Thread a rod into a plastic tube

2 Pull it out

I think you'll agree that this method works well. In fact, My retracts use flexable pushrods, and on a few occaisions when they have been ripped out on a bad landing, usually the inner rod breaks before the threads pull out.