A time-only mechanical clock is called a one-train clock, a clock that shows time and strikes on the hour is called a two-train clock, and a three-train clock has time, strike, and chimes.
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The service price is adjusted, if replacement or repair is needed, based on the cost of the new part(s) and work-time to repair. For one-train and two-train clocks, parts tend to cost anywhere between $1 to $95. For three-train clocks, the range is $1 to $150.
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Repairing a damaged clock tooth
A barrel mainspring on the winding jig for removal
Preparing a replacement suspension spring for an anniversary clock
A broken mainspring that requires replacement