10-9/16” diameter. (Same cone as the old QC-3)
Dobro-style spider bridge instruments.
Shaped like the QD-1, with straight sides and a two-step lip to accommodate both the short & long spider bridge. It replaces the vintage 8-lug cone from the 1930s and the Regal guitar, but lets you use the original short spider.
Patent Design 1934 - No. 2,045,265
Patent Design 1935 - No. 2,138,907. Made in USA.
Tension Screw not included (see below).
Installation Available, but not included