I have a question with regards to the B4.2 Mod "Grub Screw for Rear Hubs". It appears that the mod has been performed on the picture below the description, but instead of the single screw indicated in the mod descriptive text, two screws are apparently used. While this may be fairly obvious to an adept, I'm pretty much NIP when it comes to RC tech jargon and hardware. So I'm just verifying what I see as confusing. Please let me know if the picture does indeed show two grubs while the text only indicates one.