Originally Posted by
tonyfoale
Spoke nipples have small squares with a hole up the centre, so you have a small cylinder in effect with a thin wall. This means that they can distort easily when tightening, the way to control this is to use a wide close fitting spanner. I would suggest getting a quality dedicated spoke spanner. You can get these to fit a single size spoke nipple or multiple sizes.
From your photo it looks like your spanner is very thin, your problems with it are probably more due to that than the quality of the steel. It is best to have a spanner thickness at least 8 mm to hold the nipple over as wide an area as possible.
If you have a mill it is very easy to make one from some 8 or 10 mm steel stock, if you do not have a mill then you can do it less easily with a hacksaw, file and patience.
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