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Simon, very dangerous, Fully remove bolt and check the threads, if you think threads on bolt are questionable replace bolt. Pick your self up a small tube of Loctite for threads of bolt, before reinstalling coat the threads with Loctite and reassemble with all necessary washers and hardware.
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It is typical to use right handed thread so you would turn them clockwise to install, and counterclockwise to remove. The blade rotates towards the cutting edge which is typically counterclockwise, so to remove the bolt, you unscrew it, with the handle of your wrench pulling towards the back of the blade.. These bolts can be really tight. Pull the spark plug lead or remove the ignition key so you don't get an accidental start. Wear gloves, there are sharp bits.
I assume that the head of the bolt is rounded off, so you can't get a hold of it to remove it. (Most people say "stripped" when they mean the threads of the bolt or the hole are destroyed.) First, confirm the direction you need to turn it, which differs if the blade is on the right or left. If you are looking at the head of the bolt, the teeth of the blade will be pointing in the direction that you need to turn the bolt to loosen it. I assume you have already tried vise-grips to no avail. The next easiest thing to try is a small rotary grinding tool (like a dremmel) - you can use that to grind two parallel flat surfaces on the bolt so that you have something to grip. If the head of the bolt is too thin for that to work, you are going to have to use a screw extractor which requires you to drill a hole in the head of the bolt. However, if this is a left-handed thread (which would be the case if the teeth of saw are pointing clockwise, you will need a left-handed screw extractor - which might be hard to find. Good luck.
Check to make sure the blade washers are installed correctly and the right order The thread is left handed on the bolt and should tend to tighten from the toqure of the motor spining If this dosn't you could try a drop of white lock tight on the threads of the bolt but don't use red locktight its to strong
without knowing the model number I can only assume that it is a circular saw and the blade is on the right hand side and then the bolt should be a standard thread. Hold the spindle lock in and turn the bolt counter clockwise to loosen. If other than it would probably be a left hand thread and do just the opposite. Let me know and if so please provide the model number so I can look at a breakdown for the tool.
It may have left handed threads and needs to be turned clockwise to unscrew. As for sharpening an edger blade...it won't cut any differently. That short blade, traveling that fast and rubbing against concrete is going to do it's job, sharpened or not.