Needless to say that my previous attempt ended up to be disaster. Luckily, I found two bogies for the same Lima RIO car sets, so I just swapped the car from another set I have. Let's try again!
This time, I'm only pulling out the wheel on the isolated side to slide the spring.
Much better this time!
I should mention that I'm using a Back-to-Back tool from DDC Concepts to make sure the wheels are at the right gauge: https://www.dccconcepts.com/product-category/gauges-tools-and-fasteners/dccconcepts-gauges/
I test fitted the axles back into the bogie:
I can now do the wiring and give it a try on the test bench:
Next step is to bring the two wires back into the car. I decided to glue the two wires on the side so they don't interfere with the rolling operation. It's just Tacky Glue, so it is a bit flexible and it should be easy to remove if needs be:
Meanwhile, I put some passengers in the car:
Not sure yet if the glue will be fully dry today. Stay tuned ...