Just a caution. In all my years of rotary wing aviation maintenance one thing that would land you in deep stuff was to place anything against a grinder stone that did not produce sparks. Soft metals, phenolic, wood, anything that was non ferrous was forbidden. The concept is that soft material can/will imbed in the surface of the grinding wheel causing it to go out of balance and have a sudden and rapid disassembly with fragments tossed about at very high speed causing injury to the user. Maybe not the offending user but perhaps the next unsuspecting person. I'm not sure the plastic of the Smith tubes would be exempt from this.
Jim Brady
2249V
Knap's Battery
CUM CATAPULTAE PROSCRIBEANTUR TUM SOLI PROSCRIPTI CATAPULTAS HABEANT
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