That line about the cost of skipping a chain checker really hits. I used to think a slightly stretched chain was just a bit noisier. Then I saw a customer's bike where the chain had worn the cassette teeth into little shark fins. The new chain just skipped over them under any load. That one repair bill changed my whole view on a twenty dollar checker.

Actually, I read that modern washers use sensors that can get stuck.

Ever feel like you're the only one who misses the obvious stuff? I mean, I once spent hours on code when the problem was just a missing comma. Maybe my brain just skips over the simple fixes.