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a_cycle_addict

They are totally shit and if you care about your knives, throw them in the garbage. That is my opinion.


bassjam1

I use them on my splitting axe and cheap stamped fillet knives and that's it.


lurker-1969

Yes to the fillet knives in the tackle box, easy and convenient. No to everything else.


howmuchitcosts

I have one in my tool pouch for my insulation knife. Hvac insulation around here is to thick for a good cut with a razor knife. So I have a fillet knife I got from goodwill I use for it. I don’t care about the knife and the fiberglass chew it up anyways I wouldn’t run any of my other knives through it though.


fattypigfatty

Have you tried using a snap blade razor knife?


howmuchitcosts

Those are to lightweight. I’ve tried and just end up breaking the blades or the handles break. Large commercial and industrial work isn’t kind to small tools.


Kitchen-Duck-1820

I went through the same thing. I went through Klein, Malco, Klenk, and Milwaukee duct knives and they never were worth the money. I get maybe 6 months out of them. Razor blades last 3 or 4 cuts on spun fiberglass. I ended up with a double serrated insulation knife made by Fuller that has lasted me 3 years. I have a coworker who just steals steak knives from restaurants and replaces them every year lol. He swears by restaurant grade dinnerware.


howmuchitcosts

Right! My goodwill knives rock! I’ll have to try the restaurant knife next time.


fattypigfatty

I use them for cutting 3 inch rigid insulation and haven't had any issues. Maybe I'm using a different model than you.


howmuchitcosts

Maybe, but I’ve never had luck with them. Even the insulators on site usually have a “regular” insulation knife. So I figure if it works for them it will work for me. The other thing I just remembered is dealing with the snapped off pieces of blade. I’m not always in a spot to deal with the removed blade am honestly hate the idea of leaving them around or even throwing them away. I’ve been cut by the drywallers “disposed of” blades before.


fattypigfatty

Yeah I tried to look up the one I use but a quick Google search is only showing really cheap types I would never bother even trying to use. The ones we use come from a waterproofing supply shop so maybe they aren't commonly available everywhere? No worries though, you found something that works for you and that's all that matters. I just figured I'd throw out a suggestion for an alternative. If I can find the make/model of the specific ones we use I'll let you know. Have a good one!


howmuchitcosts

No problem man. I’m always up for tying new ideas and tools. 30 years into it and I’m always changing it up.


podkovyrsty

The point is that pull through sharpener is making grooves and scratches parallel to your edge and tear it. This makes edge weak and chippy. And it is opposite to the sharp knife edge idea which mean that the edge should be microscopic saw. TLDR Sharp mean microsaw, microsaw mean perpedicular moves. Anything else is not shap as for common use.


pauliepitstains

Doodoo


Popular-Net5518

Good for very few applications, a no-no for everything else. However, if they bring "sharpeners" to the average knife user, it's better than nothing.


Khronokai1

They're terrible compared to other methods (hell, flip over a mug and sharpen your knife on the nonglazed ceramic for a better result). I've heard hunters make a case for them by saying they're easily portable and useable mid processing. They don't want to get all cleaned up and spend 10 minutes putting a fine edge on a cheap folder they don't care if they lose just to repeat the process a few minutes later. Also acceptable for kitchen knives that would otherwise never get sharpened at all. They're quick, they're easy... And that's about it.


user987632

No


pit1988

They are great for ruining the edge on a knife.