Hi, I have a really nice custom 8x36, great condition, good image, but it could be improved with a clean inside, and appears to have a smear on one prism. Now I am fairly proficient at dismantling and cleaning old porro's but I can't see the way into these? The tripod adapter at the front does not appear have any way of removal, no holes for a wrench, and I don't want to try and prise the Bushnell button on the IPD end off without knowing if it does come of. I know Optic nut has worked on these, but appreciate any advice. Thanks. Ben