In my hay day I was doing repairs for 4 stores at one time and they varied. One only took 10% another 15% and the others 20%. I was lucky as most take at least 20% or more. After they all closed down because of the Internet frankly, I now make 100% but I can't make a living doing it.
I'm not sure if that is exactly what you are asking but that was my experience. I was not 'inhouse' per se. I picked up instruments and brought them back to my shop.
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