Sankey Coupler Beer-Out Cap-Off?

Anyone ever rig up a standard "D" Sankey coupler specifically for force carbing beer?

I know I can just leave the beer-out attached to the faucet to force carb... and I know I can buy a valve that I can screw onto the beer-out port to act as a cap-off. The valve for the coupler is 25 bucks though.

That said, wondering if anyone has come up with a more economical rig for force carbing sankey kegs in a dedicated way (i.e. not attached to a faucet)?

I'm thinking like a hex-nut cap or something like that??

Just curious what (if anything) others have tried.

Thanks!

A threaded cap works fine, but finding one with the proper threading isn't always easy. Removing the barb and placing a dime between the washer and the beer nut also works well, and dimes are much easier to find.

exactly the kind of idea i was looking for!!!! thanks a ton!

A nickel is a better fit and cheaper. I did the same but made a washer out of a silicone sheet to go under the nickel so the beer never touches the metal