GWB,
I have a R-309 and one of our two holed stuffing tubes. The packing is 12mm and the cable fits fine. I don't have a 4-1 tube to look at but the drawing indicates it should have a similar 12mm packing also. Normally the inside of the stuffing tube has a 16mm diameter and the packing is 12mm, what is the ID of your tube?
Snips