I took apart and cleaned my F-1 prism years ago. Not terribly hard, especially if you follow the PDF that Yeeski has provided. The only thing I found confusing was the long rectangular metal piece that fits below the eyepiece with the prism removed (I believe piece #5 in the PDF). It's glued to the prism housing so will have to be pried off before removal. Once this is off, the prism housing should come right off. Or at least that's how I remember it.