This is what I have. Got orange by chance, nice that it matches the saw.
It's a belt driven planer head on an arm.
So far it works fantastic. Exponentially faster than an ax or chisel or even a chainsaw.
This is China quality. I didn't find anything that was the same design but good quality on amazon. May be something somewhere else?
There is a Forrester brand one that attaches to your bar, but I prefer this type. The Forrester is more expensive, maybe better quality alloy/insides? Comes with a case too.
Couple of notes. Probably applies to all of them, not just this one.
The clutch is always engaged because the drive pulley (instead of drive sprocket) is too long for the shaft. It won't spin free of the clutch. The bearing it comes with is identical in size to the one I have on my Husky 152. So if the saw is running the planer head is spinning. A little harder to start in the cold because of the extra mass the engine has to spin right off the bat. You could machine it down, I may in the future, but the planer head doesn't naturally rest, it sits up.
You want to remove the pulley on the planer head and put some BLUE (medium strength) loctite on the threads. Mine broke loose when I first started the saw and went flying. You'll need a spanner wrench to loosen and tighten it. A pair of needle nose won't cut it IMO. The other end of the shaft is a 19? mm bolt head.
The 2 pulleys don't line up. Whoever designed this wasn't thinking very well. Probably thought this would sit at the same position as the ones that attach to the bar.
Not the end of the world. Will eat up the belts faster. Mine came with an extra one. I need to figure out the length so I can get a few more spares. I may cut and weld this so it lines up down the road. Probably when I get tired of buying belts.