I wanted to show the mast setting jig I made to keep the masts in alignment while inserting them into their receivers.  Without this jig it was difficult to keep the masts in line while lowering them into place.  The front end is open and the back and two sides are at the angle of the receivers with a few mm spare.  I lift the masts and hold them firmly against the back of the jig and lower them in  place.  I reverse the process when de-rigging.

https://youtu.be/aQKW79BRTPo