Hi Garry. Fellow XL user here. I've had to replace the cable holder on my 58mm and found that 1/16 inch aluminum stock doesn't hold the cable well enough. Using 1/16 inch angle aluminum tapped with straight threads didn't hold the tapered universal cable for long before stripping out. I need the stock part or tapered thread in steel. You might consider thicker stock (1/8th inch) even though it looks as if your Alpa style button has straight threads. I believe the old Nagel Kodaks sometimes had a tapered thread button like the Alpa. Good luck finding one of those, though. BTW is that a Grimes focus ring in the photo? If so, can you enlighten some of us as to how it performs in colder weather?