So yesterday tried fitting coilovers on my b6 avant. As I have had issues with pinch bolts on other cars I thought I would tackle them first. OMFG!!!!!!! what a complete **** they are. Rung the head of but there was some movement of the thread so thought cool not seized, this will be easy!! oohhhh no, those things are soooo tight. lomg story short, got it out half way after 5hours of lump hammers, air chisels and blood sweat and tears. I gave up and going to limp it to my local garage in the morning. Seriously, what a PITA they are.