C.S. Osborne Heavy Upholstery Regulator With Eye. The regulator is an extremely handy tool with a pointed and blunt end that has a eye for threading twine, etc. Osborne No. : 306-1/2 8H Overall length : 8" Gauge : 5 Used to even out irregularities in stuffing/cotton padding (point is pushed through muslin/temporary covering) Used to assist in shaping edges Used to hide brad nail tips in upholstered areas