The manufacturer doesn't always send the best linkage for the application. Often, it's what's cheapest for them to include.

You're showing your age with that "escapement" crack. I remember seeing escapment RC during my CL days, but didn't get into RC until after proportional was in vogue. I DO remember the Kraft Signature Series, Logictrol, and Heathkit, though. Linear optput servos, engines with exhaust wipers (not mufflers), and silk and dope.

Dr.1