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NICE!Excellent 'able, your pictures and description are clear and to the point.Thank you for sharing.
nice plan an instructable. Only critique strictly for the safety of your son, is that a gate that swings open out over the stairs is risky if someone forgets to latch or the latch fails. An auto latching mechanism solves both issues.
Very nice 'ible....BTW, that hole also helps relieve the pressure and keeps the block from splitting. As for spreading, make the block a bit bigger for those larger glue ups. Seal them and tag with the angle
Elegant and cheap solution. Thanks for sharing,??Be sure to save that wrench!?