Which lock?

[Old Stoney]

I am thinking of using one of the drum style patent breeches, I used one of these on a pistol once and remembered it was hard to find a lock to match up with it. Does anyone know what lock is the best to use with this style of breech?

I think that most of the percussion locks I tried on the breech came too straight down towards the drum and it needed one that the hammer came in more at an angle. Any help would be appreciated. Thanks.

[Acer Saccharum]

The locks with no cut out on the plate for the drum are the most forgiving and best for positioning. A small amount of hammer bending and nose recess grinding will always be necessary for the final fitting.