Finding a hobby machinist is going to be your best bet. Finding a machine shop that is willing to to one of a kind work can be difficult. Actually doing the job is not difficult when you have the right toys, but it takes time. The last job shop I worked at the owner would have looked at a job like that and said that will be $75 an hour with a three hour minimum if we were busy and if it was slow he might have settled for $100. So chasing a few threads can be expensive.