Smashing the button or lowering the brass ring with a piece of thread are both doing what needs to be done. The tube housing the spring is just tad to long. When whoever designed this part had the spring tube at full length of available area when depressed. This means you need to smash that extra fraction of a inch to achieve proper contact or by lowering the contact ring.
So file, sand or slice the tube (see photo line) till it works!
(Please Read this whole thread what worked for me might not work for you)
So file, sand or slice the tube (see photo line) till it works!
(Please Read this whole thread what worked for me might not work for you)

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