Hi, I am trying to make a curved double door in oak. The book I am using was written in 1830 as it is difficult to find new material on curved work. The frame is connected at the top using either a handcut wooden 'splice' (it is a bit difficult to explain - large size tennon on each end and this drops into similarly cut slots in the posts) or a 'handrail bolt' - this is shown in the drawing as a double ended bolt with round nuts at each end. The nuts would slot into a hole of suitable size and when the shaft is turned, would draw the two parts together. I am unable to find this product on the internet and have concluded that the name has probably changed. Does anybody perhaps know the modern equivalent? What I require is a suitable means of drawing two pieces of wood together - the arc is one metre (39 inches) thus I cannot put screws from one piece to the other (it would require screws of about 250mms (ten inches). If possible where I could find such a unit. The alternate is make one but this would require a suitable threadcutter!
Thanks in advance