I stuff everything into my jacket pockets and send that through the X-ray. That includes my military style belt buckle with a simple pressed metal clasp, and all the usual trouser pocket stuff - coins, phone, gum and wallet.
I've had to snip the little metal toggles off the plastic zippers on my warm winter boots - and these boots don't have any more metal in them since Virgin X-rayed them once. On some multi-airport trips (domestic-international) I've still rung a buzzer at some checkpoint despite my unchanged apparel, so I guess the toggle on my trouser fly is next followed by the two rivets in my Levis.
Oddly, and with time and curiosity to spare, I've doubled back and tried an alternative adjacent scanner without ringing it (eg: Melbourne). I mentioned it to the operator and they got their handheld out - obviously a trouble maker.
Having removed all metalwork, sharp and blunt, from every pax, the flighties then offer us all a Chardonnay from a selection of wines in glass bottles.