| Business | Phone |
| Ultimate Machining & Engnrng 1750 N Van Dyke Rd, Plainfield 60544 | (815) 439-8361 |
| Stuhlman Engineering Co 12435 S Industrial Dr E, Plainfield 60585 | (815) 436-2432 |
| Precision Metal Crafts 12201 Rhea Dr, Plainfield 60585 | (815) 254-2306 |
| Midwest Edm Specialties 24121 W Theodore Rd # 2a, Plainfield 60586 | (815) 254-2344 |