For a straight stitch machine, it should be a no brainer to get it to hit the right spot. The hole's about the same size as the one in the needleplate. I've seen a very similar one for Elnas as well. In fact, the first time I saw the one for the Elna, I thought I'd hit the jackpot.
This one is fairly highly coveted though largely because of the popularity of the machine it belongs to. And with that, I've probably given it away.
There are 3 prongs that hold it where it needs to be. I haven't put this one in place yet but it looks to me like it hooks into the slots where the dogs are so there'd be no wiggling.