Note here there are two variations in the tine modules. Cut the hole in the side of the pipe for the bolt to pass through with an oxy acetylene torch, ensuring that at least 9 of the 18 tine modules will have a hole offset by 45 degrees to the other 9 modules.

Weld a nut for the 3/4" bolts here.

Thread the bolt through. This completes the build one tine module. After creating one or 2 many can be made at once.