Make a mark through. the axle hole and drill a 1/2 hole, (or the diameter of the axle hole for your wheels), for the axle. bolt in the marked position. Cut off the end so the edge closest to the axle hole is 32 1/2 long as shown.
What causes a rapid heart rate? A: According to WebMD, a rapid heart rate, also referred to as heart palpitations, can be caused by a variety of factors, including anxiety, the use of stimulants or caffeine, stress, and hormonal fluctuations during pregnancy.
During rest, the speed of electrical signals originating from the SA node is slow, thus the heart beats slowly. During exercise or excitement, the speed of signals from the SA node increases, and heartbeat quickens. Tachycardia occurring because of rapid firing by the SA node is called sinus tachycardia. Sinus tachycardia is usually a rapid contraction of a normal heart responding to a condition or disease state. Sinus tachycardias can cause palpitations.