changing from the self tapping screws is easy and does not require any stripping down.
get some 3mm x 40mm csk head screws and nuts(ebay).
remove one of the self tapping screws and drill a 3mm hole half way through, leave the drill in positition while removing opposite screw and then complete drilling right through (just ensure the `L`shaped front suspension brackets do not move while you drill through) . fit 40mm csk head screw and nut then move on to the next one.
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