Presumably that tube on the left is a "hammer". If so, then can it be used to set the steerer's lower ("crown") bearing race too?

No. It's actually used to align the right part so that when you "hammer" the right part down (with star nut attached), the star nut will be set and aligned correctly. The left sleeve has two different inner diameters and will not slip down the steerer tube to be used to set the lower crown.

The pin down the middle is not threaded, anyone have issues with the star nut not going in stright because of this? All other tools are threaded.

I've installed two star nuts so far with this tool by tapping it in carefully. You can correct for slight mis-alignment if you go easy instead of driving it in with fewer hard hits. It's true the threaded pin makes this easier but its not essential if you are careful. If i were going to install lots of forks i would opt for the more substantial and threaded tool but for my home shop i find this tool adequate. Good luck!

Couldn’t I just use a round broom stick lol?

I'm sure you could use a broom stick or a dowl. This was my first time so I bought the tool, just in case.

Does this tool actually come with two star nuts?

Not as I recall, but then different sellers fulfill Amazon listings. I think the idea was to show it can set both 1" and 1&1/8" star fangled nuts. Of course, you could just use a bolt, some nuts and a socket that fits inside your steerer tube

Material	Alloy Steel
Fastener Type	Star-Fangled Nut
Thread Size	1-1/8 inches
Color	Color
Metal Type	Alloy Steel
Drive System	Star
Brand	BIKE HAND
Item Weight	0.2 Kilograms
Thread Type	Unified National Coarse (Unc)
Inside Thread Size	1-1/8 inches
Grade Rating	Commercial
Thread Style	Left Hand
Thread Class	Coarse
Size	Size
Head Style	Threadless
Item Diameter	1.13 Inches
Compatible groove diameter	1.13 Inches
Number of Pieces	1
UPC	610696768216
Global Trade Identification Number	00610696768216
Manufacturer	BIKE HAND
Item Package Dimensions L x W x H	3.46 x 2.72 x 1.54 inches
Package Weight	0.2 Kilograms
Item Dimensions LxWxH	3 x 1 x 1 inches
Brand Name	BIKE HAND
Part Number	YC-113A

BIKE HANDBicycle Fork Headset Star Nut Setting Tool

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Common Questions