1964 C15 GP trials frame rebuild Swing arm pin

[Woods]

Hi peeps
1964 C15 GP trials frame rebuild.
One of only 130 I am told.
Does anyone know what swing arm spindle was used..?
Was it custom or adopted from another machine ?

Size : 9 inches long x 7/8 wide. solid bar type

[Rupert]

What's your frame number? That would determine what model you have and therefore the frame and swinging arm spindle type it should have.