did i waste money

[dzcues]

I would also use a scrap hand/arm to try that method, ...especially on a joint tenon like the OP is working with..lol.
Dave

First: no long sleeves & no gloves, please. Skip the CA.

Use your bare hand as a "clutch". Grip it firmly but lightly enough that it can spin freely in your hand when you reach the shoulder. You don't need a death grip on it.

Try it on some scrap. You WILL be pleasantly surprised. Thank me later. Cash preferred.

 

[snipershot]

Yes. That will solve your problem if you get a refund and get one of my tenon threaders.

Good advice here. I had trouble threading at first, but Chris coached me right thru it.

Joe