I recently bought a reusable filter for my coffee pot. I read the enclosed instructions on how to use it,. I removed the adapter as instructed (mine is not a plus series). I locked the lid properly as shown and tried to insert it into my keurig and could not get it to fit just right for use.  It just wouldn't fit quite right. I then texted my daughter as she uses your universal filter in THEIR keurig in New Mexico.   She sent me a picture of how the filter goes into the keurig machine properly. This picture should be included in your instructions so others will have an easier time using this filter. The directions and drawing you currently use are not quite as clear as they need to be.