Originally Posted by
Jeff Wills
Long, long ago there was a special adapter center bolt that bolted to the fender bridge on the Schwinn frame and allowed installation of a Weinmann or Dia-Compe sidepull brake. Yes, the bolt that attached the adapter to the frame was at a right angle to the pivot bolt. I can't describe it any better than that, and it's been 25 years since I saw one. But they exist- somewhere.
These were common items in their day. Coaster brake bikes often had a vertical hole in the
brake bridge to directly mount fenders without a bracket. To fit these the brake's pivot bolt was fixed into a alloy block that wrapped half around the top of the bridge, and was drilled for the vertical mounting bolt, or on some versions had a vertical stud integrated into the block.
And yes they're probably still around, at the bottom of the scavenged parts bin of any shop that's been around for 30 or more years. I might even still have a few in my Dia Compe small parts drawer, & I'll bet that Peter at Cane Creek (formerly DiaCompe USA) could put his hands on one on a minutes notice.