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Roll pins come in two styles. One is a single thickness of material rolled into a circle, sometimes called a "single coil" style. The other is made of much thinner material which is rolled through several turns to form the cylindrical pin, sometimes called a "full coil" style. The "full coil" style eliminates the potential weak point at the seam of the "single coil" style, and is also typically considerably stronger in shear than the "single coil" style. "Full coil" pins will also tolerate larger variations in hole diameter and still fit tight. Suggest that you use the "single coil" style - they are considerably cheaper, more readily available, and they will fail more easily when things go bad. If you can, install the pin with the seam facing fore-and-aft, it will be less likely to collapse under the load. Any engineering supply house, or decent old-time hardware store, will carry these - they are typically found on those sections of the store filled with flat slide-out drawers filled with hardware items of all types. HTH, llater, llamas
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