Smith Corona PWP 3600 DS Personal Word Processor Floppy Disk Vintage Turns On

Smith Corona PWP 3600 DS Personal Word Processor — floppy disk model  Powers on, but cannot get a part to move- did once and used to typed, but unsure how to fix.  Side knob broke— see photos  Item Details:  - Brand: Smith Corona  - Model: PWP 3600 Personal Word Processor — Model 5F (DS floppy disk variant)  - Display: Large multi-line LCD —  - Storage: Built-in 3.5 floppy disk drive (right side)  - Print System: Smith Corona H&S Series quiet print system  - Keyboard: Full QWERTY with dedicated WP function keys — Menu, Search,  Insert, Marker, Page End, Reformat, File In, Change, Special, Format,  Tabs, Indent, Center, Under, Spell, Check, Cursor Bank  - Modes: TYPE and WP switch  - Features: Word processing, spreadsheet compatibility, PC data exchange,  Condition:  - Working — display powers on and shows text  - Body: cream/off-white plastic — light surface yellowing consistent with age, dust particles  Crack/broke right know  - LCD: bright and legible — see photos  - Floppy drive: present and visually intact — not independently tested  - 2 floppy dics and manuals included  - would recommend a good cleaning