Lawn Mower Blade Balancer Magnetic Wall Mount Replace 339075B 42-047 (Red)

What It Is

This is a magnetic wall-mounted blade balancer designed to hold and balance lawn mower blades for storage and sharpening. It replaces OEM part numbers 339075B and 42-047, and is intended for DIY mower maintenance to ensure blades spin evenly and reduce vibration.

Fitment & Compatibility

• Deck size: Universal – works with most residential walk-behind mower blades up to 22 inches long and 3 inches wide.
• Brand/model fit: Fits any blade with a center hole (typically 1-inch or 5/8-inch arbor). Not limited to specific mower brands – compatible with Toro, Honda, Craftsman, John Deere, etc.
• OEM vs aftermarket: This is an aftermarket replacement for OEM parts 339075B and 42-047. Check your mower’s manual or existing balancer model number to confirm interchangeability.
• Measurements: Before buying, verify your blade’s center hole diameter (common sizes: 1”, 5/8”, 7/8”). Also confirm the balancer’s magnet strength can support your blade weight (typically up to 2-3 lbs). Measure wall space – unit is about 6 inches tall and 4 inches wide.

Key Things to Know

• Quality: Red powder-coated steel construction is durable but magnets may lose grip over time if exposed to metal shavings or heavy blades. Clean magnets regularly.
• Installation: Requires a stud or drywall anchor – screws included but anchors may be cheap. Use a level for precise mounting; an off-level mount throws off balance readings.
• Common gotchas: Blade must be clean and free of rust for accurate balance. The magnetic holder may not work with non-magnetic (e.g., aluminum) blades. Some users report the magnet is too weak for thick, heavy blades (e.g., mulching blades over 2 lbs).
• Usage: Place blade on magnet, spin gently, and let it stop – heavy side drops down. File or grind the heavy side until it stays level.

Should You Buy It

This is a solid choice if you sharpen your own mower blades and want a convenient, wall-mounted storage solution that doubles as a balancer. Avoid it if you have heavy-duty or non-magnetic blades, or if you prefer a traditional cone-style balancer for more precise balancing. At $38, it’s a fair value for DIYers who sharpen multiple blades per season.