Mopar timing chain tensioner

It's a $30 bit of insurance and longevity. All chians stretch. Most on the market stretch fairly quick (like under 1000 miles with big cams and springs the fast rate cams like), and while it's a small amount, the tnesioner takes up any slack. Just like they said..Drill a small hole where the 4th bolt would go, and make pulling the pin the last thing you do before the timing cover goes on..lol. Otherwise it's a real PITA.