I would agree with you totally if the self tappers I am using were ordinary but they are not, they have a twin screw design so I am drilling a 3mm hole and the screws are 5mm so they give away a whole 2mm to the holding thread, I only need to be careful where they are near a weld as the metal is slightly tempered, in which case I use one to cut a thread then discard it and use a new one to hold.
Rear panel and a side to go on today so pretty much flying at the mo and really enjoying seeing it evolve into a Roadster.
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