I bought a metric tap and die set for retapping the fender stays and whatnot on the bikes. Here's what my fender stay mount looks like on my
1956 Hercules Royal Prince after it has been tapped and a SS hex bolt placed on the front fork and rear dropouts.
1956 Hercules Royal Prince - The Evolution - 8 by
Sallad Rialb, on Flickr
1956 Hercules Royal Prince - The Evolution - 6 by
Sallad Rialb, on Flickr