I mentioned in another thread that I had used a universal clip I found to make a more durable solution for the T:Slim since the Tandem cases were very lacking in the quality department, so I am going to share what I used in this separate post. You may not be able to use the exact same solution anymore as it looks like Tandem has redone their accessories so one of the parts I used isn’t available anymore, but you should still be able to find a way to make it work I believe.
So to start out with, I found a universal belt/clothing clip that was rotatable. The best one I found was this one:
It has a small metal square that has a pretty strong adhesive pre-applied, and that is the piece that you attach to the pump (obviously), the clip is magnetic so it will snap itself onto the square pretty easily, you just push the button to unclip it. I have found the clip to be pretty durable, as I leave it on most of the time and it is in my pants pocket and gets taken out and put back in a lot, so the clip has held up well. The clip isn’t super slim mind you, but you can easily unclip it from the pump and the metal square is very low profile, so when you need the pump to be more slim, it is as easy as unclipping the clip, and when you need the clip again you just slap it back on.
Now for the second part, the part that doesn’t look to be available anymore, it was part of the Tandem rotatable belt clip case. With that case, it had a thin sleeve like what comes with the vertical clip case that came with the pump, only the clip is a separate piece that the sleeve clips into. Since the clip broke quite easily, i was left with the thin sleeve, so I attached the metal square for the new clip to the back of this piece. I see that Tandem now offers a new case with a metal clip that can be attached wither vertical or horizontal, but you have to pull the metal clip out and insert it in holes in the case to change it. http://shop.tandemdiabetes.com/collections/cases-clips/products/t-case
But, you could take the clip out entirely and attach the metal square to this case. Or you could just attach it to the back of the bare pump, but I personally don’t like that idea. I am attaching some pics of my solution so you can see what it looks like.