Better than a whistle-TDC checker

[Solver]

I got tired of working alone with no extra finger to put on #1 plug hole to find TDC. I built this thing for about $3 worth of parts and it works great.
3-4 foot of refrigerator clear ice maker tubing
a compression fitting for tubing
a brass fitting that has same threads as spark plug hole
a glass jar 1/2 full of marvel mystery oil
assemble as in picture
now all you have to do is thread the fitting in and set jar on ground
I always crawl under and turn with flywheel
when the #1 cylinder comes around it bubbles into jar
just as it passes it sucks oil back up the tube
I use marvel mystery oil cause it's red and easy to see in tube
also cause if it were to suck all the way back to cylinder it won't hurt anything
you can get pretty exact by stopping after it buubles and just before it goes back up tube.
not my invention saw something similar on net