Nowhere do I see that they are not replaceable. Only difference I see is that your link has a pic of 2 cutter separate. There is only a hundred different brands and prices to choose from. Bet they all the same. Some are in stock in the US, some ship from China. Thats the only difference I’ve been able to see.
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I sit corrected. Your reference’s second photo shows the allen wrench loosening a cutter blade, I missed that and thought it was a one piece cutter.
I use one of these to knock the dross/slag off:
I got mine for about $35. Works great, but is noisy. Wear hearing protection.
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WHAT???
CAN’T HEAR YOU!!!
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It’s funny because that chamfer tool is the same concept as a woodworking router, which is super common, yet all of us metal guys are amazed to see it for steel. I’m definitely going to pick one up.
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Thats what I was thinking when I saw it. Its just a mini air powered carbide tipped router.
Anybody here used a tumbler before? I’ve got 100s of small parts with sharp edges and some dross. If a tumbler works I’m down. These are too small and the quantity too high to hold by hand with a power tool and too time consuming to put in and out of a vice. I pressed the tip of my finger into my belt sander the other day and that didn’t feel so good. Fresh belt.
I’ve thought about a tumbler many times… Then, I make a bigger part and forget all about it… Found a few examples on YouTube builds using 5gal bucket… Take a look… Good for ideas anyways!!
Quite a few vids on YouTube if you look around a bit… Good Luck!!
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Amazing! Thanks for pointing me down the rabbit hole. This will be a finger tip saver.
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Make sure you stop back at this thread and show us what you came up with…!! I’d be interested to check it out… Actually, could have used one earlier today!!
Cheers!! 
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Once my shop is built…this spring…I am building a tumbler…
basic specs…
- 20" to 24" diameter 11gauge cylinder about 3’ long
- cylinder will be wrapped in neoprene insulation to reduce noise
- 1" shaft through entire barrel supported on each end with appropriate pillow blocks
- variable speed drive…most likely an old trolling motor
- there will be a few agitator ribs inside
- 1/2" random ceramic media
been looking at youtube and kind of using this as a template…it will be Frankenstein’s little brother…but it should work…
Making a Ball Mill - YouTube
How to DIY Rust Remover Rotary Tumbler Debur - YouTube
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My Dad built a tumbler for rocks when I was a kid. Made out of gallon paint cans and three tiers of rollers, all driven by the same motor, chain drive, no variable speed. The roller arrangement works well because we could randomly take off any can while it was still running, open the can, check out the contents, change the grit, etc, and then put it back on without disturbing any of the others. It ran for days. We got a bunch of useless, but beautiful rocks out of it… 
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sounds like my High School moto…
I was thinking more chain and sprocket driven with possibly a friction clutch for easy startup and stopping…
This is the one I have been looking to make for awhile.
My main point was to use a roller drive so you don’t have any unnecessary seams in the tank. It also provides a natural ‘gearing’ rather than trying to drive a center shaft at some specified RPM.
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And you can ‘learn how to weld’ if you build this! 
I am already a perfectly fine well self-taught mediocre grinder…ooops…I mean welder…
you know the type…weld once…grind 3 times…
This tape claims to be as strong as weld maybe a good starting point.
pretty gnarly looking welds in that video
I’ve used that tape! It has excellent holding power in tension and sheer, not so good (and that’s a good thing) if you peel it. You actually don’t peel it, you sort of roll it up and it sticks to itself better than anything else and will, therefore, simply peel right off (and is totally useless after that).
See:
I also use it as a gasket on my THC control box. Since it sits right in front of my table, it gets splashed with all kinds of stuff! Still going strong, 2 years later.