1 If the screw extractor can't get a grip, you may need to drill a small hole into the screw head. 2  You will need a drill bit that is designed for drilling metal; a wood-drilling bit won't survive.urther slippage will only continue to wear down the screw head and make it harder to remove. Definitely be sure you are going in the correct direction for removal, which is usually--but not always--counterclockwise (lefty loosey, righty tighty).
the maximum heart rate is the highest heart rate achieved during maximal exercise one simple method to calculate your predicted maximum heart rate uses this formula 220 your age predicted maximum heart rate example a 40 year old s predicted maximum heart rate is 180 beats minutethere are other formulas that take into account the variations in maximal heart rate with age and gendersually this is when your exercise heart rate pulse is 60 to 80 percent of your maximum heart rate in some cases your health care provider may decrease your target heart rate zone to begin with 50 percent
Then, use this formula to determine your target heart rate: Target Heart Rate = [(Maximum Heart Rate â Resting Heart Rate) Ã %Intensity] + Resting Heart Rate So, using the example above, here's how to calculate the target heart rate zone for a 34-year-old who has a Maximum Heart Rate of 186 and a Resting Heart Rate of 74: For a 50% Target Heart Rate: [(186 â 74) Ã 0.50] + 74 = 130 bpm For a 85% Target Heart Rate: [(186 â 74) Ã 0.85] + 74 = 169 bpm So the target rate heart zone would ...