Our rectal probe has a sliding groove as well as a series of ridges along the shaft of the probe designed to lock the flange in place after adjustment. Slide the depth control flange along the shaft until you reach the desired depth then spin the flange to lock it into place. If you find it difficult to slide the flange up and down then it is probably already locked in place. Spin it a bit more until it slides freely then spin again after you have it adjusted to your preferred depth.
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I think the design is a good one as it allows for different depths. I am able to adjust it without any issues. I was initially using the probe too shallow and was getting an aggressive tingling at my anal sphincter. I used it at almost the deepest position and had a great muscle response which I could tell involved several pelvic muscles without the tingle. The challenge is getting enough of the gel deep enough to cover the probe. I cannot wait to see the results after a few more weeks!
Thanks for making such a great device!