Quoted from BeaglePuss:You are the man!
I have some other things to order through Pinball life regardless, so this works out nicely.
The original screw has a serrated face, I assume so it will not vibrate loose. You might want to throw a lock washer on there.
https://www.amazon.com/Internal-Washer-Finish-0-1500-0-2950/dp/B000NSGQK2
Pinball Life also has these screws if you don't care which style screw head you use.
http://www.pinballlife.com/index.php?p=product&id=235
It may not matter much since Balrog doesn't have the same vibration a flipper would.