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)

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

Product ID: 320901825

Details

Brand
JANYUN
Colour
Silver
Material
Silver
Number of pieces
120
Style
Butterfly

🎨120 versatile clutch & pins

📏8mm pin length precision

🔩Nickel-plated brass durability

Description

🦋 Lock in style, unlock your creativity!

BULK PACK ADVANTAGE - 120 pairs to keep your pin game strong and your projects fully stocked.
DURABLE LIGHTWEIGHT - Crafted from nickel-plated brass for lasting strength without bulk.
VERSATILITY UNLEASHED - Perfect for lapel pins, tie tacks, badges, and all your creative DIY projects.
PRECISION ENGINEERED FIT - Pins sized at 4.5mm diameter and 8mm length ensure a secure, professional hold.
EFFORTLESS SNAP ON SNAP OFF - Spring-loaded butterfly clutch for quick, tool-free installation and removal.

The JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement set features 8mm long, 4.5mm diameter pins with 11mm diameter clutch backs made from durable nickel-plated brass. Designed for easy, tool-free use with a secure spring fastener, this bulk pack is ideal for professionals and crafters needing reliable, versatile pin backs for lapel pins, tie tacks, badges, and DIY projects.

Specifications

ASIN	B072B9XGZ4
Brand	JANYUN
Brand Name	JANYUN
Color	Silver
Colour	Silver
Customer Reviews	4.6 out of 5 stars 4,246 Reviews
Finish Type	Glossy
Item Type Name	Pin backs
Item Weight	0.07 Kilograms
Item weight	0.07 Kilograms
Manufacturer	JANYUN
Manufacturer Part Number	ON01
Material	Silver
Material Type	Silver
Model Number	DGKK
Number of Items	120
Number of Pieces	120
Number of pieces	120
Product Style	Butterfly, Smooth, Silver
Style	Butterfly, Smooth, Silver
UPC	056312671964
Unit Count	120 Count
Wire Diameter	4.5 Millimeters

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