The standard center post does not fit over the top of either of the mini posts. All other fits good. I have sanded both over 30 minutes. Replace?

The standard center tube is the same size as A, B or C rocket engine. Sanding it for 30 minutes is much to long to make it fit. Used a used engine after you clean it out

Is there any way to use this to set fins that are up higher on the body, and not at the very bottom?

It depends on how high on the body they are. I've used this to set fins that are four inches or more above the base of the rocket, but those had a pretty big angle so I was able to clamp part of the fin very high on the plastic. I use a piece of wood from the sheet the fins are cut out of as a height guide so I get them all the same. If it's really high, you might be able to turn the rocket body and find upside-down and attach them that way (too far from the bottom could be close enough to the top of the body).

Does Estes sell the fins separately? I can't seem to find just fins.

Call Estes Customer Service 800 number and ask can they send it to you. Go to the website and find the contact us link

Can the fins be glued at an angle to induce spin?

The Estes PN 2231 Fin Alignment Guide is designed to only align fins vertically on the body tube. No provision was ever make to alter fin alignment as this would require flight testing of all Estes rockets to support that angling fins was OK to do on all products as it could potentially decrease the altitude performance on all products. Additionally, we do not and would not support the idea of angling fins on any Estes rocket unless that product was specifically designed to spin during launch, like PN 7258 Space Twister. The Estes Team

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Estes 2231 Fin Alignment Guide Model Kit , Color Varies

Product ID: 1211401

Details

Age Range (Description)
Kid
Brand
Estes
Color
Assorted
Item dimensions L x W x H
12 x 3 x 6
Theme
Model Rocket

⚡Supports 3/32" & 1/8" fin thickness

📏Fits BT-20 to BT-80 tubes

🔧Holds 3 or 4 fins securely

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7401 kr

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In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Nail your rocket’s fins like a pro—because precision is the new cool!

TRUSTED STEM LEGACY - From Estes, inspiring rocketeers since 1958 with quality and safety.
STREAMLINED BUILD PROCESS - Holds fins steady while adhesive dries—no more awkward hand-holding.
PRECISION PERFECT ALIGNMENT - Eliminate guesswork with exact fin placement every time.
VERSATILE FIN COMPATIBILITY - Works seamlessly with balsa, basswood, or plywood fins in two thicknesses.
UNIVERSAL FIT FOR ROCKET BUILDERS - Compatible with a wide range of body tubes from BT-20 to BT-80.

The Estes 2231 Fin Alignment Guide is a precision tool designed for model rocket enthusiasts seeking flawless fin placement. Compatible with body tubes ranging from BT-20 to BT-80 and fin thicknesses of 3/32" or 1/8", it securely holds three or four fins made of balsa, basswood, or plywood. This accessory streamlines the building process by ensuring fast, accurate alignment, reducing errors and enhancing rocket performance. Backed by Estes’ decades-long STEM heritage and a 1-year warranty, it’s a must-have for serious hobbyists aiming for professional-grade results.

Specifications

ASIN	B004LGXCLI
Additional Features	Fast & accurate fin alignment, Suitable for three or four finned rockets
Age Range (Description)	Kid
Age Range Description	Kid
Art Craft Kit Type	Model Rocketry
Brand	Estes
Brand Name	Estes
Color	Assorted
Customer Reviews	4.5 out of 5 stars 1,633 Reviews
Global Trade Identification Number	00047776022317
Included Components	SUPPLIES.SCIENCE EDUCATION.MODELS.ROCKETS/ACCESSORIES
Item Dimensions	12 x 3 x 6 inches
Item Type Name	Model Rockets
Item Weight	0.25 Pounds
Item dimensions L x W x H	12 x 3 x 6 inches
Manufacturer	Estes
Manufacturer Part Number	2231
Material	Plastic
Material Type	Plastic
Model Name	Fin Alignment Guide
Model Number	2231
Number of Pieces	1
Seasons	All Seasons
Size	Medium
Subject Character	(-)
Theme	Model Rocket Kit
UPC	047776022317
Unit Count	1.0 Count
Warranty Description	1 Year Warranty Against Manufacturer Defects

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