I need help with some my first estate purchase. What I have here is an old grabow riviera (no idea what year, but it doesnt have a plastic stem and it is adjustomatic) and I was hoping you guys could help me with some tips about restoring it. First of all it has a decent cake built up around the top third of the bowl then it tapers off as it reaches the bottom. What do I do about reaming it back some? Can I do that with a czech tool? and second, how do I clean off one of these stems and the bowl? it feels sorta gritty, almost like it was just sanded with a really rough paper. Any tips?