"double wheel", lmao. I've never heard it called that b4.
I think what you're after is "Dual-Wield" which is derived from "Dual", meaning "Two", and "Wield" meaninging "To Hold" (Usually as a weapon)
Dual-Wielding in FPSC has only been achieved using Ply's Mod, and it's very simple and easy to use using this Mod.
Simply go to the FPSC Chat board and look for the "Ply's Mod V1.07 Official Thread" and the download link will be in the very first post. You may also want to download the "AirMod Manual" which is also linked to in the first post. (This is because Ply's Mod now has AirMod V0.6 merged into it, so you also get all of the features from AirMod!) And to give you an idea of what's possible using the Mod, there are many videos to watch! OH BOY!
Though, be warned, BEFORE installing the Mod or even downloading it, I urge you to DOWNGRADE to FPSC V1.07 or V1.09 (I recommend V1.09, simply for the Editor which has the TGC Store included in it
). Once you have V1.09 of FPSC up and running properly, THEN you should download the Mod and BEFORE installing, READ THE README FILE THAT COMES WITH IT!!! It will tell you exactly how to install the Mod (Which is very painless) and will ALSO be your source of information on how to USE the Mod. Please note that the latest version is the "Beta" version, which is (to date) the most stable version.
Also, to fully benefit from this Mod, I suggest that you learn how to script as using this Mod alongside it's scripting additions will yield MUCH MORE possibilities! If you are new to scripting then I suggest when you feel that you want to learn, to look into the Official Community Guide for some starter scripting tutorials and examples. However, nothing in that guide reflects any scripts that can be made using Ply's Mod. Many of them can be made more efficiently with the Mod.
Hope that answered your question and got you on the track to getting what you needed.
The one and only,
Those who live in the past, are destined to insanity. Those who live only for the future, will be slaves to their ambitions.
Those who live in the moment... only they, are truly happy.