Hi, I have the Axminster AW10 BSB2 and would like to alter the riving knife so it is the same height as the blade or a fraction lower so I can do rebates and support the blade guard some other way, is this safe and what is the best way to do this, any advice, also my workshop is small and when I have the 2 side table extensions fitted one each side it is a bit hard to fit where I want it to go, it is on a mobile base which is great, so I wanted to get one of the side extension's cut to 150mm wide, where is the best place to get this done, I live in SE London. Thank you