Are the inserts a cone perforated insert? I have just started experimenting with them.
You have access to them there. Just cannot recall the website.
I used a perforated plate/sheet and marked them out and then hammered and bent them into shape.
Will give you feedback once running. Details 1/8 holes. Cones ended up 4" long with a 1/2 " hole in top end. Hammered larger end so that it is a tight fit in pipe. Two spots to hold in place. If they work will weld further. Because they are coned shaped that have a lot more surface area/holes to let gases through.
Cheers
Bernie