Nice money making scheme to sell to schools! As long as there has been model rocketry, the main companies have shown how do do swing tests without spending a nickel. lol

This item hasn't been in regular catalogs in the past that I know of, but they've always sold things through companies that provide items for schools like AC Supply, Nasco, etc. that weren't in regular catalogs. It may have been available before now through those sellers.

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I love sanding.