Issue link: https://www.e-digitaleditions.com/i/1466727
12 MAY/JUNE 2022 SPORT ROCKETRY thread on the nut and tighten it down so that the bolt is firmly in place. Don , t over tighten it and crack the PVC fitting. Cement the 2" long sections of 2" pipe in the sockets of the female threaded adapters, then aer those have set for a few minutes cement these assemblies into the sockets of the 3-way elbow. Set this assem- bly aside to let cement cure. Cement one of the male adapters onto the fixed-length leg on the end opposite the cap. is leg is now complete. For the remaining outer legs (20" long pieces of 2" pipe), drill and tap a 1/4-20 threaded hole about one inch from one end of each. en turn it about 90 degrees and drill and tap another 1/4-20 hole. Cement a male threaded adapter to the other end of these parts. en, aer the cement has cured a bit, thread a thumbscrew a couple of turns into each of the threaded holes and slide the open end of a lower leg into each of them so that the overall length is about the same as the fixed-length leg. Tighten the thumbscrews evenly until they press on the inner leg lightly. It doesn't take much to keep the inner leg from sliding inside the outer one, so don't overdo it and strip the threads out. Blast Deflector Drill one 5/32" diameter hole about 3/8" from the edge in the center of the scraper. en, using a vice or pliers bend the 3/4" of the scraper blade away from the handle about 30 degrees. en drill an- other hole in the handle, centered between Top: Set of finished legs. Above: Adjustable leg with alternative external slip-fit cap. ese caps may be easier to find locally. Right: Rail button on two-inch screw supporting bottom of blast deflector.