I worked as a mold maker for 10 years. We built class 101 plastic injection molds for OEM's. It was a small shop with 5-7 employees, including the owner. All of the issues mentioned( project management, ordering parts, dealing with customers, bookkeeping, etc.), were handled by the owner.
I would say the two biggest issues were maintaining a profit margin and hiring and retaining skilled employees. As a highly skilled employee, there was and is easier ways to make a living. Ultimately, the business closed when our work( I had all ready left) was being outsourced to China. There are many similarities between building molds and hot rods.
I do side machining jobs for my Dad's small custom wiring shop and others. I've been involved in the car hobby since I learned to ride a bike( long time...). While it sounds romantic to strike out and just build hot rods, I know the reality of how hard it is. I am always intrigued how guys make it.
This is a fascinating read!
Tim
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