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I recently bought a 10$ block plane just because it had a depth adjustment knob unlike the other block plane that I had.

I took it out of the box, carefully took out the blade and sharpened it using my oil stone as good as I could. Then I installed the blade and no matter how hard I tried I couldn't set the blade to protrude evenly across the width of the mouth. I had a similar issue with my other block plane which proved to be the blade not being square (the edge was not at perfectly 90 deg to the sides).

Looking more closely, HORROR! The mouth is bad. I mean the mouth is not square to the sides of the plane.

Should I try to repair it? If so, how would you recommend? Or should I try to take it back to the shop where I bought it?

Here's some pics:

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Looks like this emoticon:

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Update: I took it back to the store the next day and obtained a refund. Will get a Juuma next time (Juuma is Luban is WoodRiver is ...)

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    That is bad, possibly the worst-ground mouth I've seen on a plane (and I've seen some really terrible ones!) but, it doesn't necessarily matter in actual fact because the worst parts are at the edges where the iron cuts minimally or not at all. And this is a block plane with a fixed mouth, which doesn't have to perform at the highest level anyway. However that said I personally think this isn't acceptable in a new tool (even at this price level) and you should see if you can get it replaced.... unless this is representative of the quality of these planes and they're all somewhat like this!
    – Graphus
    Oct 2 '18 at 11:46
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    I will then try to get my money back.
    – Andrei Rînea
    Oct 2 '18 at 16:13
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    I realised after writing the above that it's actually the rear of the mouth that you were mostly concerned about, I saw the wavy front edge and got hung up on that because it's so bad LOL Anyway the rear edge of the mouth, and the bed for the iron, (both need to be worked on) can be fixed with careful filing but it's not easy work and makes the mouth bigger. So if you can get your money back that would probably be for the best.
    – Graphus
    Oct 2 '18 at 16:33
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    Not sure if you're read this previously but I would recommend anyone who is getting only one block plane to get a low-angle model with an adjustable mouth, basically a 60 1/2 in Stanley's numbering system (either a vintage Stanley or one of the copies from another maker). If there is no secondhand tool market where you are where you might find a vintage plane then maybe consider a Silverline. While they are at the budget end of the market (a step below Faithfull) I saw one recently and it wasn't at all bad — it would need some tweaking to work well, but it wasn't junk as far as I could tell.
    – Graphus
    Oct 2 '18 at 16:44
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    Never thought a giant emoji would have something to add to a question...I stand corrected.
    – Otto
    Oct 3 '18 at 6:11
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As you have returned it so not a lot of point discussing further. But just in case:

  1. It could be saved - a careful half an hour with a file might have been enough to square the mouth.

  2. Either an angled grind on the blade, or tilting it in the holder, would have given you even protrusion, and thus a consistent shaving thickness?

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