I don't think it is quite that simple Norman, the component that you are referring to as the bottom link does not exist on the Brampton fork, it forms part of the entire tubular construction, I presume the bottom, middle and top forgings of the forks are all brazed together with the fork tubes, unless you had contemplated doing that anyway, big job, not really comparable to the Girdraulic fork
There have been several attempts at achieving a decent coil over conversion, starting with the Woodhead Munroe conversion, probably when Brampton forks were still being fitted to bikes from new. John Renwick did one for Harvey Bowden, and I don't think he used the bottom coil spring bracket that the original coil spring attaches to, but maybe just bolstered up the original headlamp bracket, I might email Harvey and see if he send me over some decent photos, and an opinion on how well it all worked, I have a feeling Harvey was not overly impressed with the ride quality.
There have been several attempts at achieving a decent coil over conversion, starting with the Woodhead Munroe conversion, probably when Brampton forks were still being fitted to bikes from new. John Renwick did one for Harvey Bowden, and I don't think he used the bottom coil spring bracket that the original coil spring attaches to, but maybe just bolstered up the original headlamp bracket, I might email Harvey and see if he send me over some decent photos, and an opinion on how well it all worked, I have a feeling Harvey was not overly impressed with the ride quality.