Guides
Practical how-tos, sizing guides and maintenance tips for trimmers, chainsaws, nailers and power tools.
AF-100 Replacement Spool: Fit, 0.065 Rule & Install
Confirm AF-100 fits your Black+Decker trimmer, why only 0.065" line works with AFS, and how to swap the spool when line won’t feed.
Nailer Not Sinking Nails? When to Replace the Piston Driver
Nails left proud, bent nails or frequent jams often point to a worn driver blade. How to diagnose it and what a piston driver replacement involves.
Worn Carbon Brushes: 5 Signs and How to Replace Them
Sparking, power loss or a tool that cuts out? Worn carbon brushes are a cheap fix for brushed grinders, saws and drills. Here's how to spot and replace them.
Chainsaw Bar & Chain Sizing: Length, Pitch, Gauge and Drive Links
A chain has to match your bar on three numbers, not one. How to read pitch, gauge and drive-link count so your replacement chain fits the first time.
Trimmer Line Size Guide: .065 vs .080 vs .095
Thicker isn't always better. How to pick the right trimmer line diameter for your trimmer, and when to choose a spool or pre-cut line.
How to Replace a String Trimmer Spool in 5 Minutes
Out of line? Swapping an auto-feed spool takes a few minutes and no tools. A step-by-step guide for cordless and corded trimmers.
How to Find Your Tool's Model Number (and Why It Matters)
Replacement parts are made for specific models. Here's where to find the model number on trimmers, chainsaws, nailers and power tools — and how to use it to find the right part.