If the concern is the screw backing out then use a star or split washer.
Thread locker is another solution.
But, no. this is another item on his "sheet" of things he does that you, the customer, pay for.
I know the game. It's simple.
He does not do a "flat rate" type of job.
Remember, its $30 an hour...
Soldering the screws takes "time" which he then gets to bill for as well as the line item that's on what he calls a "build sheet".
You pay twice. Once for the item on the sheet and for the time.
Also known as "double dipping"
Another thing that bothers me is that he supposedly lives with his friend or something.
Renting the room?
Always says "money is tight" or that he "doesn't have it".
Complains that he has to work 12 hour days 6 days a week. Sometimes 7.
That would be... 30x12 which gives us $360 a day. Not too shabby.
360x6 means he supposedly earns $2160 a week.
Wow! nice!
52 weeks in a year.. 2160x52 is $112,320 a year.
And he pays no taxes.
That's just his time. That's not parts or radio markups.
This puts him in the higher tiers of earners in Chandler where the median is 72k/yr
The median home price is well within reach for him, too.
He can own his own home on his salary.
Conclusion: Either he does not make $30/hr OR he blows his money on something.
If you send him a radio so he can solder screws then you are contributing to the fleecing of America. He pays no taxes but uses the services in his city just like the people on welfare he complains about.