Ackchyually

iTrader: (7)

As per some recommendations, I purchased the upgraded aluminum servo horns from Tekno, part numbers TKR5253B for steering and TKR9353 for throttle. My servos are both brand new Protek 170TBL, and the fitment of the horns are so unbelievable bad that I thought I was doing something wrong. Maybe I got defects or something. A seemingly easy task of installing a servo horn has been next to impossible.

I have ensured the splines are lined up from horn to servo. Collar screw on the horn is completely removed. It's as if the anodizing of the aluminum is too thick, or the machining of the splines is a fraction of a mm too small. Attempting to force the horn on the servo just gouges into the aluminum and scratches off the coating. I've even attempted to spread the horn's collar a bit with a flathead screwdriver, and it's still extremely difficult. I managed to get the steering servo horn installed, but thinking about abandoning the throttle's horn.

Additionally, I noticed that he splines on the inside of the horn only go about halfway into the collar. The splines are not machined all the way into the collar. Is this the way they're designed? Most servo horns of other brands allow the entirety of the servo's shaft to push up into the horn's collar, certainly not halfway where the tightening screw would remain above the shaft. Seems like a poor design, no?

Has anyone experienced this?

petersen114

Like stated above. I purchased one of the J&T Bearing mounts a couple of weeks ago. The mount is nice with 2 hole options forward and back so the Tekno and other clutches can be used. Using a Novarossi engine with a ProTek clutch the clutch is too far forward and the clutch bell is only about 1-1.5 mm from the spur gear. I put a Novarossi clutch and bell on and it lined up perfect. I’m gonna try with an Ultimate engine and ProTek clutch when I get some time. I hope this works because I really like the ProTek clutch.