LGB-style "bottle opener" coupling

thingiverse

The plastic spring used nowadays by LGB to push up the coupling hook deteriorates over time. These sagging hooks result in spontaniously unhooking of wagons in your trains. This is my attempt to fix this by using a spring salvaged from a ballpoint pen to the pivot mechanism. (spring o.d. 4.5 mm, cut to length) The hook screws to the coupling with a M3 bolt and a washer.