I just finished sharpening my planer and jointer blades. The sharpening guide, in conjunction with the conical disk, works fine. I was looking around for something else to sharpen.
There are two observations I made.
1) The sharpening guide has three nylon or plastic buttons that are there to provide a smooth ride along the rip fence. They work fine but they also come out very easily. They travel right along the edge of a t-slot in the rip fence. It is very easy to snag one on the t-slot and pull it out. I did that; fortunately, I noticed before I messed up a planer knife.
2) There are two spring washer in the sharpening guide. These must be positioned very carefully. If not, they can be located under the knives and throw off alignment of the knifes in the guide.
Both are minor issues until one fails to pay close attention and then they could be very irritating
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