I have a Stihl BG75 hand blower with a shut-off problem. It is about four years old. I work solo, mowing about 900-1000 lawns per year -- blow off debris after each mowing. Also, I've used it for leaf work each Fall season. It has been running fine, and continues to run fine. But, a few weeks ago, the engine didn't stop immediately after moving the slide switch to the OFF position. It sputtered a bit, then shut off. The problem wasn't a major one, and I was very busy, so kept working. However, the behavior grew worse. The time to finally shut down grew longer. Then I found I had to use full choke to make it quit. I took apart the case and felt that the metal clip on the slide switch may be bent. The clip apparently grounds the electrical connection when moved to the OFF position. I got a new clip from the dealer, installed it, but the change has made no difference. The problem does not inhibit use of the blower, but is a nuisance. Something isn't quite right. Apparently the electrical grounding isn't being done properly, only partially. As I said, it sputters and runs very rough for the few seconds before finally shutting down completely. Any suggestions? Thanks.