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

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BikeHand Bike Bicycle Fork Star Nut Setting Installer Install Tool with 2 Free Star Nuts - Size 1-1/8”

BikeHand Bike Bicycle Fork Star Nut Setting Installer Install Tool with 2 Free Star Nuts - Size 1-1/8”

Product ID: 15132290

Details

Color
black
Exterior Finish
Stainless
Fastener Type
Star-Fangled
Material
Aluminum
Metal Type
Alloy Steel

🔥Heat-treated alloy steel

🔩Includes 2 free star nuts

⚙️Precision 1-1/8” fit

Description

🔧 Nail your ride setup with precision and ease!

BUILT TO LAST - Heat-treated alloy steel construction guarantees durability and long-term reliability
CONFIDENCE IN QUALITY - Backed by a lifetime warranty, made in Taiwan for trusted craftsmanship
EFFORTLESS INSTALLATION - Simply mount the star nut on the tool and tap it in—no specialized skills required
UNIVERSAL COMPATIBILITY - Designed specifically for 1-1/8” threadless headset systems—no guesswork needed
PERFECT POSITIONING EVERY TIME - Ensures star nut is set at the ideal height for flawless headset performance

The BikeHand Star Nut Setting Installer is a precision tool engineered for 1-1/8” threadless bicycle forks. Crafted from heat-treated alloy steel, it ensures perfect star nut placement for optimal headset performance. Included are two free star nuts, making installation straightforward and reliable. Trusted by pros and backed by a lifetime warranty, this tool is a must-have for serious cyclists aiming for flawless bike maintenance.

Specifications

ASIN	B00811WQG6
Best Sellers Rank	#412,164 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,280 in Bike Shop Tools
Brand	BIKE HAND
Color	black
Compatible Groove Diameter	1.13 inches
Customer Reviews	4.7 out of 5 stars 1,019 Reviews
Fastener Type	Star-Fangled Nut
Finish Types	Unfinished
Global Trade Identification Number	00610696768216
Grade Rating	Commercial
Item Diameter	1.13 inches
Item Dimensions	3 x 1 x 1 inches
Item Shape	Hexagonal
Item Weight	0.2 kg
Item dimensions L x W x H	3 x 1 x 1 inches
Manufacturer	BIKE HAND
Material	Aluminum
Material Type	Aluminum
Number of Packs	1
Number of Pieces	1
Outside Diameter	1.13 inches
Part Number	YC-113A
Screw Head Style	Threadless
Set Name	BikeHand Bike Bicycle Fork Star Nut Setting Installer Tool Set
Size Name	Size
Thread Size	1-1/8 inches
UPC	610696768216
Unit Count	1 Count
Warranty Description	2 Year Manufacturer

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