Hello neil.....
Have you a pic or a model name of them pads...never seen them but think the ones in my lbs were something like swisstop or something.....cant remember but the nylon bit was seperate and pushed over the stud and was shaped to contact the rim and flex outwards well before the pad hit....

Have you a pic or a model name of them pads...never seen them but think the ones in my lbs were something like swisstop or something.....cant remember but the nylon bit was seperate and pushed over the stud and was shaped to contact the rim and flex outwards well before the pad hit....