MP Rotator Tools The right tool makes any job easier. Use the MP Arc Adjustment Tool to make quick and easy arc adjustments and the MP Radius Adjustment Tool to make radius adjustments. Or try the new quick and easy “MP Matchstick” … the latest innovation from Walla Walla. Sprinkler adjustments can now be made without getting down on your hands and knees or even bending over. Simply slip the tool over the MP Rotator while it is running to make arc or radius adjustments.