On my high speed needles, I took them out and just kissed the little roll pin with the dege of a Dremel cut off wheel...
When I put it back in (after a good cleaning of course ) I bent the spring clip down to provide more pressure on the ridges.

I have noticed on occasion that sometimes if the spring clip gets bent out of alignment, it will allow the needle to "self adjust"...
I just put a small piece of fuel tubing over the clip...