RobotDigg miniature linear guideway; single rail cut to length with a single long block. Highest preload (Z1) and normal (N) precision guarantees a stiff / play-free and binding-free motion. Warranty The blocks and rails are non-interchangeable - keep the blocks on the rails! A violation does expire warranty effectively. Cleaning We strongly recommend to clean the rails before lubrication. Put a zip tie through the very last holes to ensure the block can not escape the rail. Fill a glass with some grease solvent and soak the blocks for at least an hour. Rinse the blocks and wipe the rail from any residue grease with a lint-free cloth. Lubrication We recommend to lubricate the ball races and bearing balls with grease, and cover the entire rail itself in a thin coat of grease to prevent oxidation. Recommended lubricants (in no particular order): CPC Lubrication Kit 18G Fuchs Planto Multispray S Fuchs Lagermeister BF2 Mobilux EP 1 or EP 2 HIWIN G05 Note: lubricants containing MoS2 or graphite must not be used.