Towerpro 9g servos & savers - calling all modifiers to the cause
 

I'm just setting up my mini-t and it's come time to decide what servo i'm getting. I'd buy a Hitec HS-5065MG and be done with it but they're expensive servos and because of the running i'm going to be doing, servos will be under stress.

I see the Towerpro SG90 (aka hxt900) and MG90 (aka hxt mg-14) servos on sale for pocket change and i see loads of people using them with no saver. I'm a product of the old school when you just did not run a servo without a saver, it wasn't done, even to a cheap servo, because it could cost you a race, or a day's bashing. I cannot run a servo without a saver, even an MG one. I've searched google and all i could find are questions from other people wanting savers with negative answers. So I've spent a day firing emails off to towerpro themselves and various servo retailers trying to find a saver that fits. All have come back negative. One shop checked their entire inventory for me, trying each on an MG90 and couldn't find one that fitted. So there ain't one. lol

So we come to modifications. I think the Hitec output stub, certainly the HS-85 type splines that require an RC18 saver, are larger than the ones on the towerpros. I think, from what i have gathered, the Hitec 5055/6 saver that comes with the mini t pro is too big too but by less than the 85 type

anyone ever tried machining a basic servo arm down so its just the splined collar, made thinner, then glued it into a saver?

What do you all think of the possibility of getting a hitec gearset (or at least, the output gear) to fit? i presume it'd require the output stub hole enlarging, which would allow another upgrade - top ball bearing. I know it's just a cheap servo but a saver could be transferred between the old and the new fairly easily as could the bearing'ed up end cap

this needs doing, they're 1/5th the price of a HS-5056 :D thoughts?

I currently have a TowerPro MG90 in my custom 14th scale RC18, and a MG90S in my RC18B2. Both accept the factory Hitec servo saver insert perfectly with no modification needed.

WHOA.. that the RC18 servo saver for HS-8x servos or the smaller hs-5x series? :eek:

edit: part ASC 21049?

I am running the ASC 21326 in both at the moment with the insert labeled "H". It is for the smaller HItec splines.

w000 that's a proper sprung saver too rather than one with a stupid plastic collar.

ordered. :lol:

Yes, it is the second generation RC18 servo saver. Much improved over the original, but I honestly thought both 21049 and this one used the same splines anyways.

Thanks for the info on 21326. I just fitted one to MG90S. ( Towerpro metal gear clone)....The 'H' horn is a perfect fit !
Only issue is the screw that comes with the kit is not long enough. I used a 2.5mm x 15mm socket head cap screw and fits nicely.

Thank you for posting the info