Stainless is brittle and I would not use stainless bolts in a safety role, standard bolts are stamped 8.8 end higher spec allen/cap screws could be used.
I have used plated domed cap screws in the top plates in 10 mm,over engineerd for that bit extra as Mark say's.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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