In need of a R. L. Drake Knob. . . . . Knob has a round base about 7/8" diameter that tapers to a rectangular finger piece about 3/8" width. This knob was used on all of the R-4/T-4 series. Will consider buying a parts rig to get the knob(s). Thanks for any help and consideration. Best regards, Ron Hensel, K9ZE Roanoke, Indiana