Estroncio,
Sorry to hear about all of your bad luck! I hope it turns quickly. The 150mm x 50mm coticule I sent you was flattened by me before I shipped it. You do know that these stones are chamfered (rounded on the edges) on the edges to prevent pressure chipping, yes? That is the only reason I can think of that would account for a difference of 1mm over 150mm. The stones are never shipped with right angle shoulders.

Howard