Skywatcher Pier Tripod Bubble Level Mount

I designed this to fit snuggly in the top part of a Skywatcher Pier Extension tube so that the tripod can be leveled before an AZ-GTI or other travel mount is mounted onto the tube.

I bought this bubble level:
https://www.amazon.com/dp/B07VT4P7TT?ref=ppx_yo2ov_dt_b_product_details&th=1