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Hi Steve
I’ve used oversized laps a couple of times. They work well to prevent or reduce a turned edge. But they are tricky to press evenly. Mel suggests warm pressing by warming up the pitch tool and mirror in warm water. You then move the mirror around over the tool as everything cools. I tend to use a circular stroke, making sure the mirror moves over all sections of the lap.
For me a tool that is about 6 mm larger than the mirror works well. I tried a larger one once and found it almost impossible to get good contact.
A normal lap the same size as your mirror is ok too and easier to press. If this is your first mirror, there’s probably a good argument to use that - it keeps things simple. You can always make a larger lap later if you need it.
Hope that helps,
Rod.
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