Let the raker gauge do the thinking

The correct way to file rakers without wrecking tie straps is to use a raker gauge and file flat.

The gauge is a cheap metal plate that snaps over the cutter and tie strap. It exposes only the raker, so the tie strap is physically covered while you file. The drive links are down in the bar groove anyway—if you’re hitting them, you’re filing way too deep or you’ve got the chain off the bar.

Put the flat file in the slot of the gauge, keep it level, and push it across the raker. Stop when the file just touches the top of the gauge. That’s your height reference. Don’t rock the file, don’t angle it, and don’t bear down like you’re trying to start a fire. One smooth stroke, lift, repeat.

If you don’t own a raker gauge, stop and buy one. They’re a few bucks and come in most sharpening kits. Guessing by eye is how you end up with a dull, skipping chain and a tie strap that’s been filed halfway to nothing.