Crank Brothers 50:50 Sealted Bearings Pedals

I had a pair of these pedals without the sealed bearings and found the bolts holding in the plates were so easily rounded, meaning you can't really tighten them enough. I've since bought a pair of the sealed bearings and, not surprisingly, I've got the same problem. I've lost bolts and bolts have loosened.
Does anyone know if there is a way round this, or if I can get extra bolts anywhere? Better bolts? Or, if I'm better off just replacing my pedals!!! I like the pedals, but I've ended trails and realised I've ridden some without any bolts holding the plate in place, and it's a bit worrying.
Cheers,
Scott
Does anyone know if there is a way round this, or if I can get extra bolts anywhere? Better bolts? Or, if I'm better off just replacing my pedals!!! I like the pedals, but I've ended trails and realised I've ridden some without any bolts holding the plate in place, and it's a bit worrying.
Cheers,
Scott
Cannondale Super Six Evo
Cannondale Slice Aero
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