Hi all
I use two methods,
1) Velcro (Mushroom headed from M3) on top of window and corresponding line on the soft top, roof no longer inverts in high winds, and has stayed in place at over 100mph.
2)15mm web Strap fixed to the top of the door then a 15mm plastic luggage push buckle fixed at the sun visor point.
I will take the strap of and take some pics and list the ingredients later
Cain