Are your fingers already sore winding high capacity AEG magazines? Here is a tool that will always be on you that is available at eHobby Asia, the Satellite Hayamaki Fast Winding Patch. Since it's patch with a velcro base you can always have it attached to your gear which has velcro areas for patches. We won't recommend to you using this with your magazine in your airsoft gun so make sure to wind magazines that you will put into your mag pouch.