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Seat Sandwich ®
From WikiPedalia
An adaptor to allow a saddle with four frame rails to mount onto a standard one-bolt "microadjust" type seat post.
The adaptor consists of a grooved brass plate which fits between the upper and lower rails, so that the vertical clamp bolt doesn't distort them by squeezing them together. This accessory includes a longer than normal bolt, and is primarily used for mounting wider Brooks leather saddles, such as the B-72 and B-66.
