Answer: With very few exceptions, VMAR models that utilize plug in wings have wing channels for the spar joiner tubes that are closed at the outboard ends to prevent the spar joiner tubes from "creeping" further into either wing during flight.

 

We recommend confirming that your wing joiner tubes are restricted from moving overly far into either wing panel. Provided that the wing tubes are limited in their motion and cannot come out of the opposite wing during flight, there is no need to glue or otherwise secure the wing joiner tubes to the fuselage.

 

If you wish to leave the wing joiner tubes to the fuselage for convenience or for ease of assembly or for purposes of transport or storage, you may wish to "tack" the tubes into the fuselage using a small amount of medium CA+ such as Zap-A-Gap applied from inside the fuselage. Just a small amount of CA+ is required.