May one that is learning Hilchos Shechita sharpen the knife that he uses for shechitah on chol hamoed for the purpose of practicing how to sharpen it and make sure it's kosher for shechitah (and not to use to shecht on chol hamoed)?
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I haven't a source for this, if your asking למעשה consult a real authority - but I would go the same way as writing. Just as writing is permitted on חול המועד for learning Toarh, if the purpose is learning and not fixing the knife - I'd assume it's OK.