I’m enrolled in the Mangosmoothie convertible top making correspondence course but I’m looking for some help for the midterm, think of it as collaboration or better yet, research! I’ve made a top frame and I’m making a pattern for the top fabric. I’m going to use German Tenex snaps but I’m trying to figure out how many snaps to use around the back. How many snaps do you all have and is that too many (wrinkling?) or too few (gaps?). 
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This is a link to a 356 Registry and is related to tonneau snaps:
http://forum.porsche356registr...php?f=13&t=28160
This IS WRONG for replicas. Do Not space the fasteners 1- 1/2" back from the body tub edge ..you will not have enough material to wrap the header bow and the side curtains will also have a huge gap at the windshield. I've done many tops and here is the right way: Fold the top in half marling center below the window along the bottom edging and center on the front rough edge. You'll need 13 fasteners on the body: Start by installing the first fastener center lined up to the center bar of the deck lid grill. The fastener edge is 3/8" back from the tub edge . Then install additional male fasteners 6 -1/2" apart ( Leave the last 2 closest to the door on both sides off for now... Then you glue the top to the header bow , after that is done go back and install the last fasteners. Be Sure to not have a fastener fall on a seam as the material will be too thick to properly install . You''' also need two fasteners for the windshield frame, two for the side curtain strap, two for the side curtain edge at the body and another two to secure the tonneau straps to the rear tub wall.
My post was more about how many to use, not the placement of the snaps. Lately people seem interested in replicating the original number of snaps and this was meant to be a guide for just that.
@ ROBERT M I guess I came across sorta harsh ...My apology . Seeing the diagram I didn't want him to ruin a top by following those measurements.
Alan Merklin posted:@ ROBERT M I guess I came across sorta harsh ...My apology . Seeing the diagram I didn't want him to ruin a top by following those measurements.
No worries. I just wanted to clarify what my intent was. I should have done that in my first post. 
