The thermostat replacement was the hardest part of the job... LOL.
Was damn hard to keep it in the hole while I got the o-ring and the cover back on it without distorting the ring.

NewToME: The tensioner has to have a small finger pin in it to keep the large tension pin back in the housing until the belt is installed. When you pull the small pin the large pin keeps the pressure on the pully plate. If you have no small pin, it is likely that the large pin has already been released. Useless tensioner. You can push it back in, but thats a good way to damage it and hence increase the odds of it failing in the future.

 

Its a good idea to replace then tensioner when you do a timing belt, because if that fails so will the timing belt. You should also do the rollers for the timing belt, including the water pump on some models, because if any of those lock up the belts done.