Years ago someone came up with a simple tool for opening a clevis. Just getting back in the hobby but can't recall what it was like. I tried a search here and Tips with no success.
Murray

I know if you can get in from the side, you can use a small blade screwdriver. In this case, I am trying to install and remove clevises on the servo arms in the plane with minimal side access.

Murray

BVMJets.com has a rather expensive plier-like tool. AMain hobbies has a very inexpensive tool.

If you have the space you may use one of these. I have one narrower than this one. Just handle and bit. Gets into tight spots. I’ve cut bits too. Can’t remember where I got it. Probably HF long ago.

https://www.harborfreight.com/8-piec...ver-92630.html

You can also bend some flat stock to a right angle. L shape. Slide into clevis and rotate handle. May work.

I use a right angle, flat blade screwdriver.

Dubro used to make one. Not sure if they still do.

https://www.towerhobbies.com/cgi-bin...01p?I=SULQ3124 Sullivan. I have a right angle screwdriver that I thought was the proper tool, but I guess not. I would have to see how this one works. Not too expensive really.

Ya , your said right

Narrow brass strip bent at 90 degrees