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Chapter 3. BallistaMail > Skein Plates, Supports, and Their Attendant Mysteries - Pg. 72

Ballista Mail lateral bracing fittings on the body. Once you're sure of the positioning, mark and drill 3 / 32 " pilot holes at the support tube locations. Separate the plates, chuck a 1 / 2 " Forstner bit, and drill out the pilot holes to a depth of 3 / 8 " into the top surface of the bottom plate and the bottom surface of the top plate. [Figure 03.16] Determining the height of the supports is more than just Figure 03.13: The remarkably useful PEX fittings. Plumbers hate 'em.