Do I need to fill out the Guarantor form for my Non-O visa extension in Thailand?

The user is seeking clarification regarding their Non-O immigrant visa extension process. They have filled out the TM.7 form and possess proof of income from their embassy. Uncertainty exists about whether a Guarantor form is required and the conditions under which it must be submitted. Community responses note that if the user has a valid income letter, they may not need a large sum in their bank account for the extension, and typically, the TM7 and appropriate documents from the initial Non-O application are sufficient.