I was a good girl last year and Santa rewarded me with some new feet for my machine, he has a few elves here. The feet seem to be fairly generic (within reason) and I have bought a few things from this ebay shop and had no problems with any even though their prices are super reasonable. If you are not sure if it will fit your machine I have found them more than happy to answer any queries by email. You can obviously get the same "brand" as your machine through sewing machine stockists.
This is the binding foot that will sew your binding straight onto your material as soon as you have whipped it through your bias tape maker. You can see the measurements on the top of the foot, you just fold the tape over and push it through the 'V' shape and then tighten the side screw to suit the width of your binding, this one can do up to 20mm.
(Top View with bias fed through)
(Bottom view so you can see how it folds the material)
I found this easiest to do before I attach it to the machine. Once the foot is one the machine you use the back screw to slide it across ways to make sure the needle is where you want it. You then just put the base material in the middle of the 'V' and off you go. The foot will fold it for you as you go and helps make sure that the base material doesn't wander off. It also keeps your binding beautifully lined up if you need to make ties, etc. I did struggle when I first got it but I was trying to do arm holes on the polar fleece vest and my binding was quite thick material too. I am hoping with a bit of practice I will be able to these as well but it worked great with cotton bias for the denim pinafore that I did, so depending on what your needs are it may be a useful addition to your sewing kit.
(Finished top view)
(Finished back view)
I fear that demo writing may not be my strong point so any queries please just ask. Hope it helped the few people that were asking about it.