http://parallaxscurioandrelicfirearmsforums.yuku.com/topic/33004#.ULIOXIaOHfI

http://www.milsurps.com/showthread.php?t=19949&page=2&highlight=charger+bridge

No photo's from me but maybe this will help. To drill the rivets find the centre of the rivet and centre punch, use a drill bit a fraction smaller than the rivet and take out as little metal as possible to expose the rivet shaft. use a pin punch to knock out the remains of the rivet ensuring the action has adequate support so that you don't bend it.( you could also drill the rivet all the way through if your dead centre of the shaft but then you would have to assume the rivet is dead straight and you know what assumptions lead to) If you can get it off without damaging anything you can sell the bridge on ebay. My 375 is built on an original Lee Speed action ,there were quite a few imported here before federation at the turn of the last century,unfortunately they were not the sporting rifle type ,they were mainly in the military configuration.

cheers
Pete