Hello, my kitchen mixer is wobbly and leaks into the cupboard under the sink its installed in. I have tightened the screws underneath but eventually they come loose again and the mixer twists around itself. I'm currently tightening by hand as I don't have a spanner or wrench that will fit - I'm happy to buy the right tools but not sure where to start. Do mixers have washers? Where might I find that to see if it needs replacing? Thanks! 
