Help! I've lost my servo screw!

[EmJayeX]

So number one, this is the servo I have in my TT02...

SunFounder 20KG Servo Motor Waterproof High Torque Servo, SF3218MG Metal Gear Digital Servo, Aluminium Case, Control Angle 270° for RC Robot Cars https://a.co/d/578xEeD

I didnt use the screw or the servo horn that came with the servo, only what came in the tamiya kit. I just bought a kimbrough servo, and as I was installing it, I noticed im missing my servo screw. So now I cant install any servo horn at all. Has anyone else experienced their servo screws backing out/going missing? And also what kinds of screws are they? How long are the TT02 screws usually?

Bummed out my car is out of commission for the moment....

Any help is greatly appreciated

[EmJayeX]

2 minutes ago, EmJayeX said:

So number one, this is the servo I have in my TT02...

SunFounder 20KG Servo Motor Waterproof High Torque Servo, SF3218MG Metal Gear Digital Servo, Aluminium Case, Control Angle 270° for RC Robot Cars https://a.co/d/578xEeD

I didnt use the screw or the servo horn that came with the servo, only what came in the tamiya kit. I just bought a kimbrough servo, and as I was installing it, I noticed im missing my servo screw. So now I cant install any servo horn at all. Has anyone else experienced their servo screws backing out/going missing? And also what kinds of screws are they? How long are the TT02 screws usually?

Bummed out my car is out of commission for the moment....

Any help is greatly appreciated

Well I actually JUST found the screw 😅

It got launched a little ways away. Either way, its too short and wont fit with the Kimbrough servo saver, so the second and third questions are still relevant

[MadInventor]

You've got to be a bit careful, as that servo has  a metal (Looks like brass) output shaft, and came with a machine thread screw (Looks like an M3 from the advert). Tamiya assume that the servo has a plastic output shaft and supply self tappers, which may destroy the threads in your metal output shaft of your servo. The good news is that M3 screws are easy to find on Ebay or a similar site, you just need to figure out what length you need for your kimborough servo saver.

 

[EmJayeX]

38 minutes ago, MadInventor said:

You've got to be a bit careful, as that servo has  a metal (Looks like brass) output shaft, and came with a machine thread screw (Looks like an M3 from the advert). Tamiya assume that the servo has a plastic output shaft and supply self tappers, which may destroy the threads in your metal output shaft of your servo. The good news is that M3 screws are easy to find on Ebay or a similar site, you just need to figure out what length you need for your kimborough servo saver.

 

I looked back at the ad, and looks like I did use the screw from that servo. Sorry though, I was a bit in a panic thinking I'd lost it. Ill have to find some M3 screws then. Thanks so much!

[Willy iine]

As for the servo screw backing out, yes it has happened to me in the past.  You can use a star washer to lock it, or I usually just put a small dab of thread-lock (blue) when that happens.  Note: don't use thread-lock if your servo has a plastic spline to attach the horn.

Some folks crank that screw super tight and while they might be okay, sometimes the servosaver itself binds preventing the spring to return the horn to center which can be a pretty annoying situation as the car will no longer drive straight after hitting a bump.