Review of Toner 0-20 dB Variable Attenuator
I ordered two of the Toner attenuators in case one was defective. One of them had a coax connector with insulation that hadn't been completely removed, making it difficult to insert the center conductor of the RG6 coax.
I removed the excess insulation with a drill bit held in my hand; the coax was then able to be properly inserted.
I still haven't figured out why they would paste the label on upside down.
It's important to check the female coax connectors to see if they make good contact with the center conductor of the coax: