Model label: IMOAssby_WSimpleObjAttach, 14163000 9-25_IMO_chunk
Assembly instructions
Insert the objective slowly and carefully into the holder. If it enters at a slight angle it can get wedged and is hard to remove. A constant twisting motion while inserting can be helpful. A dry lubricant such as graphite might also be helpful, although this has not been tried.
Secure with four M4x12 cap screws.