There are 16 "camlocks" used in total. 10 of these attach to the firewall with aluminium angle section brackets. The brackets are attached to the firewall with 4mm screws. I used M4 by 25 stainless with nyloc nuts. 8-32 aircraft screws would also be fine. The brackets below floor level were a problem as I could not get nuts on them so instead I used 5mm pop rivets. Probably would have been better to do this before the floor?
To position the brackets I held them to the firewall with a little 5 minute epoxy (with the cowl held in its correct position with tape). I then removed the cowl and marked and drilled the holes through the firewall.
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