Many "modern" machines use the crystal starburst style of pattern (offset\modified of course for different shapes). There are also "stippled" styled inserts as well. Older EM machines generally had smooth plastic insert. [Edit] In addition, there are other types of inserts but which are less...
You can interact with the ChatGPT Bot in any Chat Room and there is a dedicated room. The command is /ai followed by a space and then your ? or inquiry.
ie: /ai What is a EM Pinball Machine?