If you're able to rebuild the carburetor, I suggest getting a rebuild kit and installing new gaskets, diaphragms, inlet needle, metering lever, after disassembling and cleaning your current Walbro carb. The original Walbro carb will likely be machined better than the aftermarket cloned one-size-fits-all carbs. Here's a kit for <$8
https://www.amazon.com/dp/B07JMQ6J4J.
I recently restored a Shindaiwa T230X gas trimmer that uses a Walbro WYL-26 carb. Pretty simple to take apart, clean, and reinstall the pieces. I also restored the ZAMA carbs for 2 Echo trimmers recently with great success. Currently I have an old Echo PB-250LN blower in the garage that I am working on.