Drive pin replacement tool

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Partydaz said:
This the bad boy?👇, been looking myself at getting the pins out the shafts and this seems like a nice easy option :)
https://wheelspinmodels.co.uk/i/kyosho-amr-drive-pin-replacement-tool-set-332357/
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That’s the one

IMG_8589.webp
 
Nelson.81 said:
Bit the bullet and ordered one myself arrived yesterday but haven’t used it yet. I’m uk got my from Wheelspin models. Razor rc he recommended them he also has a vid of it.

Click to expand...
That thing is Allright 🤙
 
The interference fit on the Corally dogbones is so tight that the M3 (actually 2.95mm) stainless steel pins would bend or squash when trying to press them in. The point of using stainless steel pins is they won't wear down the drive cups so using harder pins was a no-go (the idea being that pins are easier and cheaper to change out than drive cups). So I ran a 2.96mm carbide drill bit though the holes to make the fitment a bit less tight and used retaining compound. Going forward this will also make changing out the pins easier. Installing the pins is now easy enough that I can use a vice and an old 5mm pinion, it still requires some pressing but not much and I wouldn't trust the pin to stay in without retaining compound. The way it was before with a ridiculously tight interference fit AND retaining compound (and high temp compound at that) was overkill and IMO done to make the dogbones non-serviceable so you would have to buy a full replacement, which annoys me.
 
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So after a few runs it's obvious that the stainless steel pin idea isn't going to work, the pins are already half worn through. The drive cups basically saw through them. So back to hardened pins I guess.
 
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Inexpensive drive pins, actual dimensions 2.93x13.7 exactly the same as the ones that come with the AMR pin tool:

https://www.ebay.com/itm/125942931376

Retaining compound:

SAB retaining compound sold for R/C helis. Less expensive than Locktite #648 and is equivalent (I suspect it actually is rebranded Henkel compound)
https://www.amainhobbies.com/sab-go...und-thread-lock-green-10ml-sabha115-s/p577076


Off brand compounds on Amazon, inexpensive. Use #648 for frictionless or light friction fits, #609 for press fits. Refer to the chart in the image gallery for applications and differences:

https://www.amazon.com/Retaining-648-Cylindrical-Components-Assemblies/dp/B0CHWFVV2Q/

#648 sets up within minutes but gives you at least 10 minutes where it is "set" but still allows for some adjustment of the pin position with a press or pin tool. Full cure tales longer and can be shortened by applying some moderate heat (less that 100F) to accelerate the chemical reaction. Or you can just sit it someplace warm like a windowsill in full sun.
 
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