Good post Ruppy. The only thing I do different is remove the top screw and just leave the center post attached to the wire and slide it out.I am adding a picture tutorial for replacing the top cap
First you will see the following image again. I am starting with it to highlight its importance!
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STEP 1
Your top cap
Loosen the top screw 1 turn
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Step 2
Unscrewing the cap
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Step 3
Opening it up
Carefully lift the cap after it is unthreaded. REMEMBER there is a wire attached.
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Step 4
Removing the wire
HOLD the connector and remove the screw
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Now swap caps and reverse the instructions to reassemble.