Following others advice here, I was able to replace the hose inside the vertebrae using this uxcell Silicone Tubing 1/2 inch(12mm) ID x 5/8 inch(16mm) OD 3.3ft 1m Flexible Silicon Rubber Tube Air Hose for Pump Transfer Clear from amazon.
I opened up one of the vertebrae near the threaded connection. It took a bit of prying and I noticed those snap-on fittings are going to fail if I keep having to change the inner hose. Near the output hose end, I pushed the tube on, then used a zip tie. Cut to about 9 inches, then push on the threaded end and used what seemed to be a press on collar. Re-assembled everything and it seems to work! For my four moto-massages, it saved me over $400. They don't travel quite right, but not sure if that is the air hose or something else.
