circle, you are on the right track & almost home... hang in there a little longer.
BTDC = before top dead center. Your TO should be timed to spark at 7 degrees "before top dead center" during idle speed. The distributor will automatically shift the timing to ~30 degrees at full throttle.The difference in position of the #1 piston between TDC (top dead center), 7 degrees BTDC, and 20 degrees is miniscule, maybe not even noticable, you can only note that fine degree of position on the flywheel thru the timing hole.
Slowly rotate your engine backwards and you should see the low end scale 5-10 degrees swing around into sight. You can also drop the semi-circle flywheel cover on the bottom of the bell housing, ~3-4 bolts, and you will be able to see a wide swath of the flywheel to help you find the elusive scale you are searching for. When you find it, use a dab of white paint to mark the 7 notch so it is easy to see thru your little timing hole.
Once you find that 7 mark & get it up to the timing hole mark, do as Jerry and other have posted in the past, turn on your ignition and rotate your distributor by hand until you get a spark plug spark. Then you are timed, tighten down the distributor. Alternatively.... if your just looking for #1 position on the distributor cap. You have it now, pull your cap & the rotor will be basically right under the #1 location. You probably can just start your tractor as is (it should run, just not very good), then use a timing light to dial-in 7 degrees BTDC at idle speed. George
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