You guys have helped me with everything else thus far, so I figured I'd toss this question out there, as well. I'm a total chainsaw newbie. I've helped a friend down a couple of smaller trees a few years ago but it was nothing extravagant and I've basically made just one cut in my entire life. No joke. I picked up a Husqvarna 445 with an 18" bar a couple of weeks ago (manufacturer refurb on eBay) and used it extensively for the first time this past weekend. My only issue was with the chain itself. It seemed like it was becoming loose and drooping on the bar rather quickly. I know this is an issue with new chains from what I've read, but it seemed extensive? It may be user error in the way in which I'm cutting and/or it may be the fact that I just can't grasp the connection between the chain tension bolt and the nut holding the bar onto the case. 1.) For cutting, should I not be putting any pressure on the saw itself especially when cutting larger rounds? I used some pressure on with the saw while cutting and I'm wondering if that's a factor? Although, the chain still seemed to become rather loose even if I didn't operate the saw in that manner and even after just a couple of cuts. 2.) For the mechanical part of it, the chain tension bolt/screw was tightened as much as I could and the same goes for the nut holding the bar onto the case. Both of these were locked down ftight and the chain was STILL loose at which point after a couple of more cuts, it ultimately came off the bar entirely. If neither the chain tenson bolt/screw nor the nut holding the bar onto the case could be tightened anymore... the only solution was for me to remove the cover entirely, pull the bar taut and then replace the cover. This would last another couple dozen or so cuts before I had to repeat the process all over again. I had to do this 4-5 times yesterday afternoon while chopping down the pile I got from a co-worker on Saturday. I read the manual again and clearly, I'm missing something or is this all part of the process?