There are many different styles and sizes of domes that can be worn on a miniRITE/RITE style hearing aid. The size and shape is based on your ear canal size as well as your hearing loss. It is not uncommon to wear two different sizes of domes.
Based on how much ear wax your ears produce will determine how often your dome needs to be changed. You can clean the domes by wiping them down with a dry cloth or tissue.
Different size domes for Oticon, Bernafon and Sonic hearing devices:
Lining up the dome and receiver post is the most important part, once lined up correctly a firm grip and push is necessary. If you are not having luck the first time, lining up again accurately is more effective then more force.
Note: The end of the receiver post is bent due to the curve of our ear canals- Work with this bend rather then against it when lining up your dome.
Some people find it easier to use a hard surface like a table or counter to support the dome and then press the receiver post down into it. Think of it like putting the handle into an umbrella -Place the dome upside down like a top/umbrella and then pushing the receiver post straight down into it like the umbrella handle.