| Year | 1953 |
| Date | 08-Jan |
| Volume | 108 |
| Issue | 2,694 |
| Page | 38 |
| Category | Workshop |
| Part | |
| Title | Square-Headed Screws |
| Author | |
| Notes | Square-head cap-screws, dimensions of a 3/8" Whitworth square-headed clamp screw, forming the square head, the lathe filing rest, milling the screw head |