A yard period is a different job. Propose it as one.

Refit supervision by the project, scoped in writing and priced separately from the management agreement.
Between October and May, three yachts can dock within weeks of each other. Fleet and technical managers are running vessels in service while that happens, and a refit is a different job on a different clock. In most cases it is also a different scope.
Owners do not read it that way. When a yard period runs long or runs over, the question lands with the management company whatever the agreement says. The line between managing a yacht and managing a project is clear in the contract and invisible from the other side of the table.
Which is why the useful moment is early. A yard period named as a project before it is booked, with its own scope and its own budget, is a proposal. The same conversation three weeks into an overrun is a defence.
SuperYacht Tech is that project: a written scope, a fixed monthly fee and a named deliverable, for the yard period only.
What it changes. Your people stay on the work only they can do. The yard period still gets someone who has spent nine years on the yard's side of that table and knows how a variation order is built before it is presented. And because the fee is fixed against that scope, it sits in your client's budget as one line instead of an open day count nobody can forecast.
Your client stays yours. No account is ever taken, reporting is in your format, issued on SuperYacht Tech's report template, and SuperYacht Tech is paid a fixed fee by the client and by nobody else. No commission, no yard mark-up, no supplier rebate.
SuperYacht Tech works within a scope agreed with you and reports to you. The mandate, the authority and the client relationship stay with you.
Fifteen minutes on the phone is usually enough to know whether it fits.
SuperYacht Tech specifies, compares, recommends, verifies and reports. Orders, contracts and variations are approved by the client or its representative. The works themselves are carried out and warranted by the yard and its suppliers.
The brochure sets out the full scope of what can be covered by the day and by the project, and what each costs. Available on request.

