The plumber was so late (I think that he totally forgot the appointment. After I called back after the visiting window is almost over, the plumber just departed for my property). A young plumber stopped by. However, he could not figure out how to disassemble the shower value after watched the Youtube and called his master. This is fine as there are so many product/brand in the market, no one can know everything. He charged me visiting fee of $99 and told me that he will provided the solution in 1~2 days with quote. If I am happy with the solution and quote, $99 will be deducted from the solution package. However, I have never heard back from him....