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Explanation: I have seen and used this expression.
The clockwinder winds them and mends them. See extract of following folk song (although of course here he does even nore that that):
"OLD GERMAN CLOCKWINDER"
A German clockwinder to Manchester came
And Peter Von Gherkin was the old German's name
All up our street with his little brass bell ...
"Some clocks for to wind," this old German would yell
I toodalum I toodalum, I toodalum I ay
I toodalum, I toodalum in the old fashioned way
I toodalum, I toodalum, I toodalum I ay
Well I winds 'em by night and I mends 'em by day
ding dong, ding dong, ding dong, ding dong