Pro-Source Manufacturing, Inc

Contract Machining and Assembly


ProSource Mfg was started in 2011 by Keith and Kris Rillema. Originally located in Holland, MI, they recently moved the business to its current location in Grand Haven. The new facility provides the necessary space to offer quality manufacturing you can count on. ProSource is ready to serve your needs with exceptional contract machining and assembly.


We offer CNC Machining on all levels of production from prototype to higher volume production. We welcome the opportunity to become your preferred supplier for your machining production needs from project specific to Kan Ban programs.


CNC Milling, 3 and 4 axis machining

Turning, 3” bar feeding, 12” individual part turning with live tooling capabilities

Saw Cutting, 10” capability


Reverse Engineering

Design Consultation


Our highly skilled staff has over 50 combined years of experience in Contract Production Machining. Industries we serve include Material Handling, Medical, Aerospace, Automotive, Food Processing, Office Furniture, Motor Sports, and more. We offer solutions tailored to your needs.


Mazak VTC16B 4 axis Vertical Milling machine, 16 x 44 Travels

Mazak VTC20B 3 Axis Vertical Milling Machine, 20 x 44 Travels

Mazak VTC20C 3 Axis Vertical Milling Machine, 20 x 65 Travels

Mazak SQT18M Lathe, Milling option

Mazak QT15N, Auto bar feeding capability

Mazak QT Nexus 250 Lathe

DoALL Production Band Saw

Various tool room support equipment

Sales & Engineering

Keith Rillema


Admin & Accounting

Kris Rillema