Built one of these yesterday. Works great! Already new that the TDC was true so wanted to check it out. The fluid will move as u turn the crank so turn slowly and use plenty of clear hose. When the fluid changes direction u've went to far. Shot some wd40 into that little hose using the straw that came with the wd40. Had a cheap compression tester that had a quick disconnect hose so didn't have to cut anything.
How to find TDC - Do It Yourself Hot Rod Kustom Website