Great Farmer Hourly Rate Shirt
Imagine a knife which point you drag across grain, it makes a tiny incision, cuts fibre. Then there is another that runs right beside that one, it also makes a tiny incision. The next one is on the first track, it both lifts tiny pieces that were cut "through" and deepens the incision further and so on. If you push this "knife point" with any force, this becomes impossible as the point embeds itself so deep that you just can't move it forward. So if the top was set as a push saw and the bottom as a pull saw or vice versa, the “double the friction” thing would be minimized, but it seems like you’d have damage to the teeth when they came together each time.
Buy it: Great Farmer Hourly Rate Shirt

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