I charge £30 per hour on site visits, plus parts. if someone brings the item to me i charge £20 per hour plus parts.
Imo you cannot charge extra because you had to buy a tool item, thats your problem not the customers.
Tools pay for themselves many times over so i think it's irrelevent ?
Don't give a 12 month warranty on the motor either, it's a consumable part and noted for poor reliability... give 3 months only.
Careful giving a price, as them 24 heads, (if the machine has moon miles on it) the brushbar and spigot can be worn and make hell of a racket when running.
It's an hours work, i charge my rates to try and make a living, not for beer tokens.