Phew ! that’s a relief.
I was about to reposition the tubes and rotate slides etc. although the design doesn’t seem logical, I prefer your original layout statement. So I think its just a question of float level and making sure the needle seats. As for senior moments, I’ve just spend two days installing an inline tap to stop the oil (from my Douglas’s oil tank) gradually filling up the crankcase when parked , but immediately realised all I needed do was to close the needle valve on the drip feed !!!!! 😳