Dad bought this style of a manual sharpener over 40 years ago.
Sportsman Earth Series Bar Mounted Manual Chainsaw Filing Guide-8�2597 - The Home Depot But, it was all cast aluminum. In fact, I still have it, and use it, and it has sharpened MANY chains. He liked it so well, he bought 2 more. One to take to the woods, just in case, and a spare in the shop. They were bought through Zip Penn, now Cutter's Choice. Also bought files through them at a good price. Looked at the site, and prices are still a pretty decent price.
Cutter's Choice Online - Chainsaw Files & Accessories Buying by the dozen, makes for a good discount. I've still got a couple boxes left, from when I cut firewood to sell years ago.
The sharpeners are easy to use. There are 2 small guides that set on top of the bar, then clamp it in place, anywhere along the bar. Set the angle of cut (we set it at 35コ). Always check for the worst tooth, and start with it. how ever many strokes it takes to clean it up, make that many strokes on the rest of them, to keep the chain even, so it will cut straight. Just be sure and mark that firs tooth filed with a lumber marking crayon, or paint pen, so you know where you started.
I clamp the saw in the vise to hold it. When you finish one side, flip the saw around in the vise, to do the other side. Then flip the file guide, to file in the other direction.
They do make guides to file down the depth gauges, or rakers, but after you've done it a while, you just learn to make 2-3 passes with a flat file, to dress them up, after 2-3 cutter sharpenings. You also learn to not take to much off the depth gauges, or it will snag the chain when cutting. At least, until the chain dulls a bit.
If you get this type, and take care of it, it should last you the rest of your life.