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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🔗 Lock in style and never lose your edge!

DURABLE ELEGANCE - Glossy silver finish on sturdy brass offers a professional look with lasting strength for all your creative needs.
COMPACT PRECISION - Pins measure a sleek 8mm length by 4mm width, perfectly sized for delicate lapel pins, tie tacks, and badges.
UNMATCHED SECURITY - Nickel-plated brass clutch backs lock pins firmly in place, ensuring your accessories stay put all day long.
EFFORTLESS INSTALLATION - Spring-loaded butterfly clutch backs snap on and off without any tools, making your craft projects seamless and stress-free.
VERSATILE CRAFTING ESSENTIAL - Ideal for DIY jewelry, lapel pins, name tags, and more—unlock endless creative possibilities with this bulk pack of 120 replacements.

The JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement set features 8mm by 4mm nickel-plated brass pins with spring-loaded butterfly clutch backs. Designed for easy, tool-free installation and secure locking, these glossy silver pin backs are perfect for lapel pins, tie tacks, badges, and various DIY craft projects, combining durability with sleek, professional aesthetics.

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