I actually had problems with the sounds in the video above but after I did the velcro thing it dissipated. As far as changing strings I change em one at a time but when I put the velcro on it I did them all at once. Its no biggie, take in mind I am not a luthier I am just a hobbyist. I think everyone has a opinion on how to do things you just have to find you own way. I posted the picture of my bridge I used a heavy duty adhesive velcro and cut it about 1/8 of a inch wide. Laid it across right up next to piezo.