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Bow-Spring Bypass Closet Door Floor Guide
This floor guide replaces the snapped plastic guide on a pair of bypass closet doors. It has two 47 mm channels on either side of an 8 mm centre divider, which sits in the gap between the doors. A flexible 1.8 mm bow spring in each channel holds any door from 35 to 45 mm thick (1-3/8 in and 1-3/4 in doors) without rattling. Fix it with #8 screws (4.2 mm shank) through 5 x 12 mm slots so you can slide it to line up with any track. It is 146 x 50 x 30 mm, the gusseted walls take the side load, and the doors need at least 5 mm of clearance above the floor.
Barn Door Roller Floor Guide
Floor-mounted anti-sway guide for a sliding barn door: four print-in-place rollers form a 37 mm channel for a standard 1-3/8 in (35 mm) door slab, so the door rolls instead of scuffing on a plastic block. The 80 x 72 x 30 mm base screws down with two #8 / M4 screws through 4.5 mm counterbored holes, and flared entry wings at both ends catch a swinging door; needs at least 8 mm of floor gap under the slab.