Question: What type of plastic control rods do you use? Are they splined or not?

Answer: We have used a variety of different plastic control rods since inception in 1999. From mid 2004 onwards we standardized on a new inner/outer plastic rod set. The rod set is of our own design. The inner rod is splined, the outer rod is not. The inner rod accepts our 2mm threaded metal studs and most other brand of studs. Always test for a secure joint when using threaded metal studs.