What's a good glue to secure these onto plastic or metal? Super glue isn't working well enough.

I sometimes use E6000 glue. It's not a instant bond glue, but it's very strong. I recommend small tubes of the glue so you don't have to worry about it drying out in the tube. I also like to roughen up the back of the pin pads with some sandpaper for extra grip.

Will these work for needle felt brooches? I'm thinking they would make the brooch easier to attach to clothing. Standard brooch pins can be tricky

Assuming a felt backer, i would say Yes, if poked thru the backer and secured prior to the backer being affixed to the Brooch. with this in mind, a tack pin with a larger, maybe 10mm head, and a longer shank might work better. These Tack shanks have a 4.5mm head on a 8mm long shank. something with a 10mm head on a 8-10mm shank might work better, as most felt is 2-3mm thick. this is dependent on the backer material you use of course...

Do these tacks leave holes in the fabric once they're removed? Tack pins I have used before have damaged the fabric.

I believe it depends on the fabric. I used a satin/polyester blend and it did leave holes in my material.

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JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement with 8mm Length 4mm Width Blank Pins for Craft Making (4mm, Silver)

Product ID: 44346483

Details

Brand
JANYUN
Color
Silver
Material
Brass Silver
Number of Pieces
120
Style
Versatile

🔒Secure spring fastener grip

⚖️Lightweight nickel-plated brass

🛠️No tools needed, effortless install

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3.86 OMR

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Description

🦋 Lock in your style with effortless, secure pin backs!

ROCK SOLID SECURITY - Spring-loaded butterfly clutch ensures your pins stay locked and won’t budge during daily wear.
PREMIUM NICKEL PLATED BRASS - Durable yet lightweight material offers lasting strength without weighing down your designs.
EFFORTLESS SNAP ON SNAP OFF - Install or remove pins in seconds without any tools—perfect for busy creators.
VERSATILE CRAFTING ESSENTIAL - Ideal for lapel pins, tie tacks, badges, and DIY projects—unleash your creative potential.
BULK PACK FOR UNLIMITED CREATIVITY - 120 pairs in one set means you’re always ready to craft, replace, or gift with confidence.

This 120-pair set of 8mm x 4mm silver butterfly clutch pin backs by JANYUN offers a durable, lightweight, and tool-free solution for securing lapel pins, tie tacks, badges, and DIY crafts. Made from nickel-plated brass with a reliable spring fastener, these pin backs provide a firm grip and easy installation, making them a top choice for professional crafters and everyday users alike.

Specifications

ASIN	B072B9XGZ4
Best Sellers Rank	#2,093 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #6 in Jewelry Making Pin Backs
Brand	JANYUN
Brand Name	JANYUN
Color	Silver
Customer Reviews	4.6 out of 5 stars 4,938 Reviews
Finish Type	Glossy
Item Type Name	Pin backs
Item Weight	0.07 Kilograms
Manufacturer	JANYUN
Manufacturer Part Number	ON01
Material	Brass, Silver
Material Type	Brass, Silver
Model Number	DGKK
Number of Pieces	120
Product Style	Versatile
Style	Versatile
UPC	056312671964
Warranty Description	Manufacturer Warranty for 90 days from date of purchase
Wire Diameter	4.5 Millimeters

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Excellent communication throughout the order process. Product is perfect.

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