Remove the clip behind the back blade flange holding it on to the housing and lift it up of the return spring, replace the opposite way remembering to relocate the return spring. Make sure you get the model number correct as the 390 and 390k are different.
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Remove the clip behind the back blade flange holding it on to the housing and lift it up of the return spring, replace the opposite way remembering to relocate the return spring. Make sure you get the model number correct as the 390 and 390k are different.