How do you insert an axle into the bearing-- if it's too small it won't engage the bearing. Does one crimp it somehow?

The axel should be only slightly smaller in diameter of the inner hole on the pulley. Mine is held in place on my printer by the sidewall of the bracket and nylon bushings on either side of the pulley that holds it onto my printer and keeping it aligned with the drive motors pulley on the other end.

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⚙️ Elevate your 3D printing game with precision that never quits!

MULTIPACK CONVENIENCE - Five pulleys per pack mean you’re always ready to upgrade or maintain multiple machines without delay.
ROCK SOLID SHAFT STABILITY - 5mm bore fits standard shafts perfectly, eliminating slippage and boosting machine reliability.
BUILT TO LAST BUILT TO PERFORM - Durable aluminum with oxidation treatment resists rust and corrosion, keeping your setup pristine.
PRECISION ENGINEERED SMOOTHNESS - 20 toothless grooves ensure whisper-quiet, frictionless belt tensioning for flawless 3D prints.
PERFECT FIT FOR GT 2 TIMING BELTS - Optimized for 10mm width belts, guaranteeing seamless alignment and peak mechanical efficiency.

The WINSINN GT2 Idler Pulley is a high-quality, toothless aluminum pulley designed for 10mm width GT2 timing belts, featuring a 5mm bore for secure shaft fitting. Engineered for 3D printers and CNC machines, it offers corrosion resistance and smooth belt tensioning, packaged in a convenient 5-pack for versatile use and easy maintenance.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Brand	WINSINN
Material	Aluminum
Belt Style	Timing Belt
Compatible Devices	3D Printer
Colour	5mm Bore Toothless
Manufacturer	WINSINN
UPC	686603768907
Model number	10MMHL20T5N
Number of Memory Sticks	5
Item Weight	21 g
Package Dimensions	11.2 x 7.2 x 1.3 cm; 21 g
Item model number	10MMHL20T5N
Are batteries included?	No

WINSINN GT2 Idler Pulley - 20 Toothless, 5mm Bore, for 10mm Width Timing Belt, Aluminum - Ideal for 3D Printers, CNC Machines (5-Pack)

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