What is the best way to install this device? The one I have flew off tonight and I'm not sure which end screws on to the trolley screw.

The hex end screws on to the trolley shaft. The square end is for releasing the spring.

Does the kit include the bolt that the tensioner attaches to?

No. The only item that is included is the tensioner itself.

How long is the spring when expanded & operational. I had to remove mine, and need to compress it back

Don’t try and reset the old one. Replace it with is new one for $4.33. P/N. 41B4103

Does this part need to be greased?

No, it does not. It comes with an oily film on the part and needs no more lubrication.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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LIFTMASTER Garage Door Openers 41B4103 Tensioner Assembly

Product ID: 365977521

🔧Universal fit for all belt drive models

⚙️Precision-engineered tension control

🛠️Durable, lightweight design (41g)

€ 27.89

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

€ 27.89

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Description

⚙️ Elevate your garage game with precision tension mastery!

EASY INSTALLATION - Designed for quick, hassle-free replacement to get you back on track fast
LIGHTWEIGHT DURABILITY - At just 41 grams, engineered for long-lasting performance without added bulk
SEAMLESS COMPATIBILITY - Fits all LiftMaster belt drive openers for effortless integration
PRECISION TENSION CONTROL - Ensures smooth, whisper-quiet garage door operation every time
TRUSTED LIFT MASTER QUALITY - Backed by a leading brand known for reliability and innovation

The LiftMaster 41B4103 Tensioner Assembly is a lightweight, durable replacement part designed specifically for all LiftMaster belt drive garage door openers. Engineered for precise tension control, it ensures smooth and quiet door operation, offering easy installation and trusted brand reliability.

Specifications

ASIN	B00DDZJ9H4
ASIN	B00DDZJ9H4
Batteries Included?	No
Batteries Required?	No
Customer Reviews	4.8 4.8 out of 5 stars (358)
Customer reviews	4.8 4.8 out of 5 stars (358)
Date First Available	6 December 2012
Date First Available	6 December 2012
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	41 g
Item model number	CECOMINOD028913
Item model number	CECOMINOD028913
Manufacturer	LiftMaster
Manufacturer	LiftMaster
Package Dimensions	18.69 x 14.6 x 2.39 cm; 41 g
Package Dimensions	18.69 x 14.6 x 2.39 cm; 41 g
Part number	41B4103

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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