Optima Limiter Gear Nut

[OffCamber]

I am missing the reverse thread nut that fastens the Optima limiter gear. Does anyone have a good online resource for finding these type of nuts? Am having a hard time finding a replacement. Thanks.

[DennisM]

I think Your best shot would be a hardware store or an old model aviation shop that carries Graupner or Robbe spares.

You use a M2,5 polyamid nut and force it on.

German ebay has a set of M3 links and rechts mutter, one of each, but this is not lock nuts.

Or You could buy a M3 links gewinde tap (reversed thread) at the german ebay.

I´ll check my local hardware store monday and see if they stock any reverse threaded lock nuts.

[highwayracer]

Don't force a metal nut on there because the shaft will break If you can't find anything, the best thing to do would be to use a nylon nut (losi 4-40). The nylon ones from kyosho are too soft (and small) and may not hold. The PRM versions may work as well.

[DennisM]

Polyamid is plastic

[OffCamber]

@DennisM, @Highwayracer

Thanks for the ideas guys. I hadn't considered a nylon nut. Can't seem to find the reverse thread M3 nut anywhere, even specialty shops.

[clm]

They are not nylock... but

http://neweramodels.mybigcommerce.com/3mm-threaded-turnbuckle-nuts-set-of-six-6-pairs-total-of-twelve-12-nuts/

https://www.fastener-warehouse.com/product-p/293550.htm

-still searching-

Chris

[Optiman]

McMaster Carr has some left hand nuts
http://www.mcmaster.com/#left-hand-threaded-finished-full-hex-nuts/=oiyrom

http://www.mcmaster.com/#left-hand-threaded-hex-nuts/=oiytu8

You can alway take a normal nut and deform it just a bit to make it a lock nut.

[aip47-2008]

Don't force a metal nut on there because the shaft will break If you can't find anything, the best thing to do would be to use a nylon nut (losi 4-40). The nylon ones from kyosho are too soft (and small) and may not hold. The PRM versions may work as well.

x2 best bet for sure IMO.

[OffCamber]

Hey thanks for those links. Will check them out.

Appreciate all the great ideas guys. Just trying to get the nut so I can use the part.

[highwayracer]

One thing I forgot to mention is that the RPM nylon nuts aren't threaded. They can be used for 4-40 or 3mm in either standard or reverse thread

[rccars4sal]

I have an ot-74 limiter gear, and its fixed with a philips head screw. Is this not the same gear set? Were there different productions of the same part?

[GoMachV]

There were a few variations of that shaft and gear

[Coelacanth]

That doesn't sound right; there should be a threaded shaft protruding through the limiter gear, with the gear attaching with a gold-colored reverse-threaded nut. The original Optima gear (not the Turbo's OT-74 Limiter Gear assembly) is just a sold single part with the gear fused to the shaft, so no nut or screw. Also note that there are 2 kinds of OT-74; some had a thick, beefy spring while the other had 3 or 4 little spring-washers. They did the same thing but I've heard the beefy spring one was the better one.

More discussion on this gear setup is here:

http://www.rc10talk.com/viewtopic.php?f=30&t=17162

I've never owned the OT-74 with the spring-washers, though...only the thick spring kind.

[GoMachV]

Pics stolen from eBay

[Coelacanth]

Ahh, go figure, that's the variety I never owned, and the pic I found of it only shows the side view.