I see the full line plus a hair of the shadow for 1.0 on the scale. If it less then you wouldn't see the 1.0 line or barely see it. Anyway, that's what I see.
Looking at a video, it appears it has been too long since i used one as I am reading on the wrong side of the line and reading up...
That's typical. In the last 10?? years they have been building mowers with a cover underneath the mower covering the belt reducing the grass collecting problem u have. I posted a pic here before where grass collected forming the shape of the whole cover.
You could look around to find a...
If you have seen some of his experiments you know what I am talking about.
I just found a mower with a Briggs Quantum engine. It ran bad. Taking a wiff of the tank, I noticed the owner used paint thinner as gas.
Dumped it and added gas and it runs fine.