P. L. Robertson

Robertson's efficient manufacturing technique using cold forming for the screw's head is what made the idea a commercial success.

[3][4] Robertson then relocated the company to produce his screws in Milton, Ontario, the following year after the town had given a $10,000 loan for the factory's local establishment.

[3][4][6] The new location also provided incentives to Robertson's factory such as direct roads to the plant, reduced water rates, a sewage disposal system, and a railway siding.

He was turned down by Robertson who felt it was not in his best interest and shortly after that, Ford found that Henry F. Phillips had invented another kind of socket screw and had no such reservations.

Although the Robertson screw is most popular in Canada, it is used extensively in boat building because it tends not to slip and damage material, it can be used with one hand, and it is much easier to remove/replace after weathering.

[15] By October 1946, Robertson was admitted as a patient at The Homewood Sanitarium in Guelph, describing his condition in letters to friends overseas as being "many foul diseases, including diabetes, blindness, and many others.

[16] In 2001, Robertson was inducted into the Canadian Hardware and Housewares Manufacturers Association Industry Hall of Fame.