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I'm old school. I put a small screwdriver through the centre hole, if one side hangs low it needs more removing. I buy from various online, but L&S Engineers are a useful one.
............. the only snag is that the central hole is often just "cosmetic" with the blade actually being secured by bolts either side of this hole. The hole only needs to be a fraction off from the exact centre of the blade and it throws the whole balncing out making it innacurate. If you just do the same number of passes with the anglegrinder on each end of the blade, you shouldn't need to balance the blade.
I hadn't considered that the centre hole might be off centre but it seems unlikely (not impossble) that they would make a blade perfectly centred and balannced, then re-clamp it off centre to drill a cosmetic hole. You might have a steadier hand than me, but I can't absolutely guarantee that every pass of the grinding wheel is identical, or how much to allow eg if the blade has hit a stick: so I will continue to balance when I sharpen.
Agree..... does seem unlikely but you never know what happens in these chinese facroies knocking out cheap pattern parts. Had an old blade in the garage and just checked and triple checked the centreing of the hole.... not bad but slightly out by about 0.25mm whether this would significantly affect the balancing I don't know.
An interesting tip I've found when sharpening blades which I'm sure people will find hard to believe!! Instead of putting the "chamfer" on the top of the blade, put it on the bottom. There's no discernible affect on the quality of the cut or collection but the blade stays sharp much longer. Give it a go...... nothing to lose.
There is a YouTube channel by RJL gardens who discussed sharpening and balancing blades.
He sharpens new blades as they come not very sharp and surprisingly not very well balanced
I use a chords less angle grinder. Count the passes, check it a tape measure, then balance with a socket wrench.
Same as Tim, put a screwdriver through the central hole and check for balance. Also I put a bit of copper grease on the blade bolts when refitting so I know they'll come undone again.