I purchased a second hand OEM windstop, I was searching for installation instruction, I recovered the templates drawing from Dieter's website, the only difference with Diter's instruction are in the use of 2 steel spacers to be fitted between the Tbar and the plastic blocks, I guess these spacers shall provide a stronger fixing of the plastic brackets. You will not squeeze the bulkehead, with the of damaging the surface due to brackets vibrations, see the attached picture.
Why do I need the paper templates ? I understand the scope of templates is to drill the 12mm holes directly on the top of the heads of the M8 bolts in order to be able to loose and take out the M8 bolts without removing the main rear bulkhead finisher.
But in order to make a better job why not remove the bulkhead, loose the M8 bolts without removing them, then pressing down the bulkead in order to mark/stamp the hex bolt heads shape in the plastic, this should provide a more precise reference for drilling. Ok it's longer but you are sure to match the position on the bolts and carry out two more precise holes.
Thanks for you advice.