if you had been an active contributing poster for years and were respected for your decades of deep professional wisdom, that would still be a tough ask.
Sometimes it is great entertainment, even so.
Remember when King Richard spent post after post after post walking a guy through trying to scrape more accuracy into a cheap-ass not-even-hobby "Wrong Foo" mill-drill-shaped object that did not OWN anything sound enough to
attach an improvement TO and have it hold precision for even an
hour!
Then went into a thermonuclear hissy-fit over the thread should not be
allowed on PM because it was all about hobby grade shite he was OFFENDED BY as a "professional"!
Even though HE had been the main contributor
to the dirty deed?
Frickin'
Priceless!!!
diebog? There's your problem. And why we do NOT make the attempt.
The collection of temporarily-draft-deferred scrap metal under your hand simply cannot HOLD any more precision than it already has. Eg; "not a lot".
No matter HOW hard you try to improve it. Lightly built s**t
moves.
If you want a precision level?
"First... " acquire SOMETHING you can actually USE it
to good effect with.
Meanwhile, among life's funnier things. The Chinese make FAR better
levels than they make hobby-grade alleged machine-tools.
You don't NEED a Starrett, Lufkin, Scherr, VIS, EDA, or Weiler.
A basic second-tier Japanese, French, Eastern European, or even Chinese "shorty" block level @ about 4" to 6" start at $28 bucks, and will get into tight spots on a small machine. Add a parallel or length of ground stock to extend the span?
That will cover anything "needy" you can actually make USE OF with that rig you have.
Get a better machine "later"? Buy a longer, better, level,
later.
I still have FAR more work for my Chicom "shorty" ones that I have for the 42" US-made one.