I wouldn't mind having a few FSI D18's and D20's if they were reliable. The D18 was similar to a C5 (kick with a weak tail) and the D20 was like a C11 (kick and no tail). They were baby D's, around 12 or 13 Newton/s, but for someone like myself that does school demos on small playgrounds, they would be handy. Other than the C11, you have to cluster to get a good kick with low total impulse.

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I love sanding.