We offer three different types of tensioning devices that vary based on the style beam the jaws will be clamped to. Harrisville Designs looms have a slanted back beam, so our original tensioning device jaws are designed to conform to the angle. Many other looms have flat back beams (for example, Glimakra, Macomber, Leclerc, Dorset, and Ashford) so we have designed tensioning device jaws to fit those as well. We also offer a tensioning device we've designed specific to Shacht's Baby and Mighty Wolf looms.