I have a 1985 Peugeot P16 (mixte). The Weinmann 730 sidepull rear brake was located at the seatstay bridge.
Q: Is it safe to relocate it to the gusset plate located behind the seat tube and attached to the intermediate stays (because i don't know the name of the head tube to rear drop out twin tubes!).
The brake, with a spacer, will physically fit, but i don't know if it's the right thing to do. Seems this would leave the seat stay bridge for rack & fender mounting.