Rebuilding Fox Factory Shox

I've run this up before probably, but need some guidance. Have a set of Fox Factory Shox piggybacks that need a rebuild. I am a bit paranoid sending them off the Thor given some of the delay and cost stories, but probably more because I had an airshock from a set go missing when someone (not thor) promised a shaft repair and flaked.

Anywaze, I am going to do them myself. There is not a piggyback specific manual, however, although Thor has some pointers for the piggyback reservoir. Curious if anyone who's had his mitts dirty doing one of these that can offer some guidance, I gather the trick is in position the piston in the reservoir on assembly.

Any guidance much appreciated.