The size of the stream is one of the determining factors on the size of the seam. Long Thin little streams(very hot glass)for wirepulls,flames and most swirls. Therefor nondistinct cutoffs.(the flap(LOL)******* Short wide streams for most others= Noticable cutoffs(seams) ***Slags mixed in the pot and were made with many sized streams . Very generalized and No diagrams but this should help. (LOL) Peace,Galen**** Look at corks A multitwist(thinner stream) rarely shows its cutoffs.(seams) While the barely twist(Patchy types) have noticable cutoffs(seams). Not exactly the same but a fair analogy.