that looks like half to me!!
Yup it works just fine - but unless you need to fit them in a small space like Randy there, just leave them whole. Theyre cheap enough not to have to get 2 outa every one you buy! And you can get them in many sizes - 10mm is the smallest Iv used and I hated them. Too fiddly and tended to pick up just one string - bigger be better if you have the room.
How many are you looking to buy? Even if you don't have a credit card, many places like CB Gitty will take PayPal.
yes it works fine. just use scissors ..
the biggest i used was 2" from an old telephone
Old Lowe asked me to come up with a new piezo disc pickup for his cones. What i did was cut a 41mm [ 1 1/2" round ] disc to the shape of the cone edge, hot glued the cut piezo on the cones edge and covered it with a milled out piece of purpleheart. The cone is lifted off the lid with thin washers. It`s wired directly to the jack. Wow i was surprized at the sound, with hardly any unwanted noise like disc`s usually give off.