I'm with Jerry. Good insurance policy. I have an AT&T Go-Phone. $25 every 3 months which gives you 100 minutes. And they roll over. Currently have over $300 balance on the phone.
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I can't tell the thickness of the wood you are using. If you are using 1/4" thick wood then the Flying Dutchman puzzle blade is the best blade I have found.
If you are using 3/4" thick hardwoods such as cherry, walnut, and maple, the best blade I have found is the Pegas Modified Geometry #3,5,and 7. I have tried em all and switched to Pegas some time ago.
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3M 77 and Elmers are entirely different products and are used in different applications.
3M 77 is good for a permanent bond
Elmers for a temporary bond, i.e. patterns on wood to be removed after cutting.
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I really like #2!
Great learning tool for kids.
Check out this very informative site for the benefits of puzzles:
https://www2.highlights.com/on_parenting_with_dr_schwager/solving_the_puzzle_why_do_kids_love_puzzles_istar_schwager_phd