That sounds like the exact same size as the end of a decking screw.
For my Yamaha TW200, I got one decking screw (which is a perfect fit - available from most hardware stores) and screwed it into a small piece of wood. You then just hold that and the spanner and Bob's yer uncle.
Yes, you can do it with pliers, but (for a special like me) this way makes it heaps easier.
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