this is what I have attached to my bed. I've been using it for over a year now. I cut around the bobbin cover and have a hole for the oil spot - so I don't need to take it off, though I can easily loosen it from the machine and leave it attached to the table - then it lines back up perfectly when I put the table back. I love it so much I bought a second one to have in stock in case something happened to the one in use.
here is a picture I took showing how I use it to keep my seam line accurate when making the binding.
