Originally Posted by
minibarn
It is a Janome JW7630, and the walking foot is not for that machine, it is actually for a Brother I had years ago! It seems to fit fine, but I wondered if that could be the reason for the tension problem.
Jenny at Sew Classic has some good information about buying a walking foot and she takes apart two to show you. She points out that the walking foot must match the feed dogs to do a proper job, lots of photos on there, so just google for "Sew Classic walking foot". It could be that the Brother feed dogs had a different configuration than what you are using now.