Joined: Feb 2012
Posts: 19,381
Likes: 5,527
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Industrial "O" rings come in all sorts of sizes. Take your hub and axle to a better hardware store and see if they have a small enough cross section ring in a close to snug diameter. Multiple rings can be "ganged" on the outside of the axle spacers/cones/lock nuts to further keep a seal against the hub shell/freehub body. Stein does this with their Zerked BB Grease Injection System. Andy