I was always taught that if you're interupted in any check list type
of activity to go back to the beginning and start over until you get
to a proper finish. If it is already assembled, you just need to check
that it is complete and correct.

My flying group is a very talkative and helpful group so we often
interupted in assembly or disassembly, so this technique works quite
well.

Also on our 1-26's only the pilot installs and fastens the Turtle deck
so he can check that all 10 pins are installed and locked before
flight.

JayWalker