I just looked back at the original post advert and it is the same attachment used by the Oregon Powersharp system but the advert doesn't mention that it needs a special bar and chain to go with it.
well take back what I wrote earlier, that system looks good from here!
I have one of these (actually the cheap copy version off eBay), a badly damaged - hit a large stone - chain sharpened on the the saw in about 5 mins, then it cut better than it did before :-)These type are meant to be very good. Made by Stihl
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I have one of these (actually the cheap copy version off eBay), a badly damaged - hit a large stone - chain sharpened on the the saw in about 5 mins, then it cut better than it did before :-)