We make ""O""-Ring rod guides to fit most Ruger #1's. The rod guides will fit some other Single-Shot rifles such as Browning 78's, High Wall or Low Wall actions. These rod guides insert directly into the chamber and extend out from the chamber a few inches to control the cleaning rod. Similar construction to our bolt-action cleaning rod guides and will accept Sinclair Solvent Ports.
Big Book Catalog, Issue:69, Page:331
Sinclair, Issue:5B, Page:015
Sinclair, Issue:5B, Page:138