This is going to sound like a dumb question but I'm having trouble installing my accutrigger. I bought a silver blade accutrigger off the classifieds, I have a target action. I know the PTA usually comes with the red blade target model but these should be interchangeable right? I can't seem to get it together so it functions properly and I was hoping somebody could point me in the direction of a video or diagram that clearly shows how it goes together. Or if anybody feels like taking the time to give me a how to lesson that would be appreciated.