Hi
This winter I made some mod for my Esprit Wiper arm used Toyota aygo -citroen1- peugeot107 as some parts.
Her is the my instruction:
1. Used C1 wiper and 2 * 5x20mm and 4 * 5x8mm bolts, 2 * 6mm spacer and 8mm 5M ball stud bolt
2. Drilled and puched out 6 nitter from C1 (2 nitter has 6 mm) and later tap 5 M secondary arm and 5M tap the holes
3. Made a copy the mounting plate and (drill 5M hole to fit the ball stud bolt)
4. Made 2 spacer 6mm x 16mm, so 5mm bolts fit within 6 mm holes (where the wiper blades mounting arm )
5. Cut the main/secondary arm to match the length (my case around 47cm ) and make 4M holes each arms and 5M tap
Need fil down ball stud bolt to fit the secondary arm
I hope it will help
Yasuo