I posted this in vintage as well, but it's a pretty general question and no one's responded yet. I've taken the front brake caliper apart on my Honda XL600R. On re assembly, I can't push the pistons past the outer seal (dust seal). The seal keeps dislodging and coming out of the recess. I've lubed it up and tried a lot of things with no success. Any hints? I buggered up the seals trying to reassemble but have new ones on the way.