I’ve packed epoxy into the cylinder, assuming this plastic welder epoxy marries up to the plastic, I would suspect it would now work similarly to sistering a joist.
It’s not the plastic cylinder that ended up failing, but the tip, where the cylinder had a hole in it to accept a pin. That seems to be the point of failure on this assembly.
I believe the following pictures reveal the failure point.
I could have just fixed the tip end. I figured the more steel and epoxy there was to hold on to the assembly, the better the repair would be.
The weak point now, as I see it, is where the steel, epoxy and plastic shaft all meet at the handle. I wouldn’t doubt that the epoxy ends up being stronger than the plastic. The question is how well does it bond to it?
I’ll report back if this ever fails.