Hmmm, being about the same vintage as BelArgUSA, I have to agree with his comments.
The absolute last item on any before takeoff check should be...
CONFIGURATION CHECK
Flaps .... SET, and agree with the takeoff data
Spoilers .... down
Stab trim .... set
Compasses .... aligned, and agree with the takeoff runway.
Omit these items.....prepare for possible large problems.