Many modern day spotting scopes now come with a 1.25″ zoom eyepiece as standard. An advantage of this is that many 1.25″ telescope eyepieces can be used on these scopes.
The video below shows how to remove and attach eyepieces on such spotting scopes to ensure a secure fit and how to take care of the eyepiece. Note that when you remove and replace these eyepieces, the compression ring on the OTA is quite a tight fit, so if you need to turn the eyepiece, do so in a clockwise rotation. The reason for this is explained in the video.