Profile: Robt. L. Rowan & Assoc., Inc specializes in repair designs for large equipment foundations such as reciprocating compressors, pumps, fans, blowers, mills, crushers and skid mounted equipment. Our hybrid chock is a two-piece chock with a shim pack sandwiched between the two plates. We provide Rowan Tri-Brid™ improved universal engine support system that fits any model engine frame. We offer many corrosion inhibiting products.