I need advice. I got my Lenni in 2010, at that time I didn't know anything about having a longarm. I really stretched the canvases, really pushed my skills at keeping things square. I went to floating my tops just so I didn't have to use the horribly stretched canvas (thank god for all the you tube videos). I am replacing them today (they got stained in the move) and want advice on what everyone does to keep them in great shape. TIA