what part is connected to this called? cant find the white knob thing ?

Wish I had a better answer 😐 It is called a thumb knob but you will not find it as individual part it is sold mounted to the faceplate as is the opening handle. I would suggest going to your local Re-Store/Habitat to hopefully find a used one, a new faceplate is around $200 from Anderson.

Is this one piece or two. When I inspect mine, the inch-long rectangular cylinder part comes out. Does that mean it is broken?

It is broken. return it for another one. The two pieces are supposed to be joined together from the factory. I'm a locksmith. I purchased one to replace a part that had separated on a customers door

Is this the part that springs the handle back in place when latching the 3 point lock. Right now my handle just sags but still locks.

No, this piece actually locks the turning knob. My knob kept turning and wouldn’t latch to lock. This fixed that issue.

I don't know if it is the Original Equipment Manufacturer but it does match the OEM part exactly and works very well.

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Andersen Windows Andersen Hinged Door Lock Actuator

Product ID: 246115335

Details

Brand
Andersen
Finish type
Unfinished
Mounting type
Door Mount
Manufacturer
Andersen
UPC
749995700419

🔒Precision locking actuator

🚪Compatible with 400 Series Hinged Doors

🛠️Easy installation with 2 screws

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EC$341

Duties & taxes included

In stock

Sold byAmazon GrenadaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Lock in peace of mind with precision-engineered reliability

LIGHTWEIGHT COMPACT - At just 9 grams and slim profile, it fits discreetly without adding bulk or weight.
UNIVERSAL 400 SERIES FIT - Designed for Frenchwood Hinged Patio Doors from 1988 to present—future-proof your home upgrade.
GLOBAL COMPATIBILITY NOTE - Ideal for local Andersen doors; international versions may vary—know your fit, avoid surprises.
TOOL FRIENDLY INSTALLATION - Secured with just two screws and a limiting plate—get it done fast, no hassle.
SEAMLESS SECURITY INTEGRATION - Locks effortlessly beneath the escutcheon plate for a sleek, tamper-resistant finish.

The Andersen Hinged Door Lock Actuator is a lightweight, precision component designed to fit 400 Series Frenchwood Hinged Patio Doors manufactured from 1988 onward. Installed beneath the escutcheon plate and secured with two screws, it offers a discreet, durable locking mechanism that enhances door security without compromising aesthetics. Note that international versions may differ in fit and specifications.

Specifications

Manufacturer	Andersen
Part Number	2579542
Package Dimensions	10.21 x 4.7 x 0.99 cm; 9.07 g
Item model number	2579542
Size	xx3
Colour	Xx3
Finish	Unfinished
Item Package Quantity	1
Plug profile	Door Mount
Batteries included?	No
Batteries Required?	No
Item Weight	9.07 g

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