This is one of my "hobby horses".I don't think that the brake plates were designed to give 60 years of service.The piece of triangular bracing to the brake cam housing as mentioned by Doug Hollis in Forty Years On is a good plan,likewise bracing of the stop that locates in the fork.If this piece is bent or loose throw the brake plate away!If it fails in service it could kill you.If you have any welding done,check for cracks and crystallization.Now for the brake shoe pivots.Over time these converge and become a bit "elastic";thereby failing to hold the shoes flush against the drum over the entire contact area.Many years ago a clever local owner narrowed the brake shoe eyes and fitted an accurate brace over the inner ends of the pivots to keep them parallel.I can't remember how he kept this in place.An even better plan might be to make up an assembly with this feature which could be bolted to the existing plate,like the racing plates.I leave the detail design to others better qualified.Go carefully,F5AB/2A/7945