Hello all, I went to change rail on my cambo SC model from 24 inch to 12 inch (I'm pretty sure the cheaper models all have the same square rail) and had a real hard time fitting the rail into the front standard. Rail went in much easier on rear standard. I had to put pressure up against the workbench to get it in. I pressed in the small pin on rail and had the friction knobs unlocked. Once it was in the knobs were very stiff and would often spin without moving the rail any further. I've used it on and off for about 30 yrs but never had it lubricated and the last time I used it was about 6 - 8 months ago so I'm thinking it may need to be oiled/greased but I'm not sure how to take it apart and what/where to lubricate. Can anyone give me a simple explanation or a website with instructions on how to? Thanks.