Spring is a queue, not a rush. Knowing how many jobs fitted through the workshop in the same fortnight last year is what decides whether to book customers in advance rather than turning them away in April.
Parts define the promise. An older or less common machine can wait weeks for a component, and a customer told that at the start is patient while one told after ten days is not.
Storage is a contract. Dates in and out, the condition it arrived in, whether it is insured while on the premises and what was done to it meanwhile: it is a service with obligations rather than a favour.
Riders arrive with parts they bought online. Fitting a customer's own component changes who is responsible if it fails and what can be charged, so whether it was supplied by the shop has to be recorded on the job rather than remembered.