Chippers are a valuable addition to the yard power tool arsenal. They can turn brush piles, branches, woody debris and other yard refuse into valuable mulch and wood chips. As you feed the debris through varying size hoppers, powerful blades instantly shred it into smaller chips. You can then spread this mulch around bushes and shrubs to help inhibit weed growth and retain moisture.
Several methods are available for dealing with screws that tend to vibrate loose on covers of equipment such as chainsaws. One good fix is to remove the offending screws and wrap 1/2-in.-wide Teflon tape around the threads and then screw them back in. The tape will hold the screws tight, yet will allow you to remove them when necessary.