I'm not sure this qualifies as an amazing tweak but it's certainly a handy bargain.
Always nice to be able to see what's going on with the needle.
http://Xtra-Funky Exclusive Clip-On ..._lIvjAb7SE5XN7
I've got mine clamped to a glass shelf after removing the wee flappy bit from the clamp and I'm loving it.
Has battery or usb power depending on your preference or liking.