There is a lot of stress in writing a patent application, and it is not easy for the inventor to do it himself. Although there is no substantive examination of the utility model, if there is a problem in writing, you will be allowed to make corrections. If the corrections fail, it may be rejected, resulting in the loss of time and money, and the patent will be abolished.
There are plenty of samples, you can download them, the instructions and the attached drawings. To put it mildly, if the claim is not well written, it will cause you great losses. If you are interested, you can call me. If you need a sample, tell me what it is, so that I can search it for you.