My precut WF3 former was contoured to match the shape of the fuse where it gets attached at former 4. The top side was also concave like WF1 and WF2. It was long enough on the base side to go all the way from the fuse to the end of the fillet base, just like WF1 and WF2.
Adrian's manual says to glue WF1, 1 1/4" (31.75mm), from the front of the fillet base. Is that about the same as 15 mm behind former 2?
Mike