Magnetic Wall Mount Blade Balancer Red Replace # 42-047 339075B Lawn Mower Blade Balancer Improved Version

What It Is

This is a magnetic wall-mounted blade balancer that lets you hang and spin-check a lawn mower blade for straightness before reinstalling. It’s designed for universal use—any standard single- or multi-hole blade with a center hole large enough to fit over the magnetic post.

Fitment & Compatibility

• Blade center hole diameter: Must be at least 5/16” (8 mm) to slide over the magnetic post. Larger holes (up to ~1”) work fine because the magnet holds the blade in place.
• Deck size / mower brand: No deck or brand restrictions—this works on push mowers, riding mowers, zero-turns, and tractors as long as the blade has a center hole.
• OEM vs aftermarket: Works with both, but aftermarket blades with off-center holes or uneven thickness may not balance correctly.
• Wall or steel surface: Requires a clean, dry, magnetic surface (steel stud, tool chest, or included adhesive metal plate if your wall is drywall). Check that the mounting screws are included (they are for this version).

Key Things to Know

• No tools needed for balancing: Just hang the blade on the magnet and spin it. The heavy side will drop—mark it and file or grind that edge until it hangs level.
• Magnet strength is improved over the original 42-047/339075B version—holds up to about 3 lbs (typical residential blade). Won’t hold heavy commercial blades over 4 lbs.
• Installation is 5 minutes: Mount the bracket to a vertical steel surface or use the included adhesive plate for non-magnetic walls. Make sure the surface is level, or your balance check will be off.
• Common gotcha: If the blade has debris or a thick paint coating, clean it first. Dirt or rust can throw off the balance reading.

Should You Buy It

Buy this if you sharpen your own blades (even occasionally) and want a quick, repeatable way to check balance without buying a cone-style stand. It’s best for homeowners and DIYers with standard residential mowers—skip it if you have heavy commercial blades or need to balance multi-hole universal blades that don’t center on the magnet.