Now you know why I charge $500 to rebuild a stove. But I still think you will come out okay if you stick with it and rebuild that stove properly. Once it is done it will operate as a new stove.
I found it amusing to read all the ideas on how to extract a bolt. If I went through all that trouble I'd have to charge $2000 or more to rebuild (taking three days to do what should take five minutes). Sorry to sound condescending. No offense meant. But it really is not that complicated. Just drill out the bolt, tap it, and move on.
To drill out a bolt - grind or file to a smooth flat surface, center punch the bolt (in the center of the bolt - of course), use 13/64" stainless steel drill (for 1/4-20 bolts, the most common, or use appropriate size drill for another size bolt) and drill out the bolt. Careful not to go too far if on an exposed casting. A drill stop may be useful - I use a peice of masking tape. Tap the hole with a flat bottom tap and cutting oil. Insert new bolt. Done.
If you end up off center you can open up the hole on the mating peice and use a washer. Or, use a heli-coil.
Rebuilding an Encore should not take more than about four or five hours. If you are a novice, it may take a full day. If you've got the time, you can save the $500 you'de pay a professional stove rebuilder. But even if you have to hire a guy like me to rebuild your Encore, and end up paying $1000-$1200 for parts and labor, you'll still end up with a good stove for half the cost of a new one.