to me it looks like someone screwing a jar lid onto the top of the PF.
i do something a bit different.
i call it the "SPOCK-fleth" thats right you heard it here first. for all you trekkies out there the spock-fleth is a variation of the traditional stockfleth.
i dont have a big enough hand to it it the real way. so i make the "live long and prosper" sign and then do the motion. i can get some real nice even extractions using the "spock-fleth" i kind of pinch the mound between the "v" while turning. then after 2.5 turns i smooth the top like normal. i guess i like the name the most. but it is still a circular distribution similar but different enough.
you can also do the "peace-fleth" works just as well althouh the name isnt as fun.
thanks for the time.
jon