Hi Peter = Do you charge any more for your labour when you fit parts supplied by your customer?

The reason I ask is I work by myself and average around £10 per chargeable hour on profit from parts so I have the attitude that I would be losing that amount by using their parts, and when all goes to a tin of worms because their parts are wrong or don't fit then it is holding up my workshop space and again - costing me money. So I charge an extra £10 per hour and they can like it or lump it.

Graham