I have a 2003 Sportsman 90 that I bought for my son. The chain tensioner was missing when I bought it, so I got one from the dealer but I'm not sure exactly how it is supposed to be attached. There is a spring and an arm with a wheel that the chain rides on.Would anyone be so kind as to send to me or post a closeup picture of the chain tensioner setup and how it attaches to the frame? TIA