Removing the SRV on a Taiwanese Svea 123R clone?

My Champion SVEA 123R-clone leaks through the SRV. The cap seems to be the same size as the Svea cap (I can swap them & the stove works) but the pentagon hole is completly buggered up. Any suggestion on how to get the SRV apart so I can see if the parts interchange? Thanks,

 

Turn the hex part and see what happens

 

I cannot get it to move. I am afraid to grip the boby of the cap too tightly and possibly warp it.

 

I've gotten them out soldering a bit into the nut...

 

Put it on stove tank. Get it hot. Use a piece of leather to pad some channel lock pliers or whatever you have to keep cap from turning. Turn hex.

 

Well, I tried all that except the heat, and stripped out the hex too. Used a quality 10mm 6 point socket.

 

Personally think that the hex would have been part of the cap and not moveable.

 

I would try the heat and if you have a small piece of leather to grab it with so not to mar it. In the past I have held the one part in the vise with leather and grabbed the other after applying heat. Ended up slightly crushing the inner part but straightened it out and cut a slot for a screwdriver.

 

I did that one. Work good but warm up first.

 

I tried an EZ-out as the hole was already buggered up, no luck. I will look for one of the GraBits, seems like a better design. I'm pretty resigned to replacing the cap at this point so there isn't much to lose.

 

@Ziradog I know exactly what you mean...at this point its war (something I say to myself when I have come up on similar situations.

Looks like this one is really similar..
CRAFTSMAN Screw Extractor, 3-Piece Set (CMAT133) - Amazon.com

DEWALT MAXFIT ULTRA Carbon Steel Extractor Set (3-Piece) DWAFEXTRACT3 - The Home Depot

 

I cannot wait to see the results. Good luck

 

Ok, I see, the EZ tool goes deep in which is not convenient here.