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I have honed with coticules 10mm x 40mm. Longer is better though. If you paid a premium price for it and you aren't happy with it maybe contacting the vendor would be the best thing. You could use it...

Welcome to SRP. I wouldn't be crazy about the glued corner but that is a nice looking stone. You might see if they would discount it or replace it but if you kept it the stone would probably be fine....