Yours are coarse thread. These are a fine thread
What size bit does it say to use.
Did you insert these with the slot exposed (for use with an insert tool like it is designed for)?
Or
Did you insert slot side first thinking its a self tapping insert?
They look very similar in design and cause lots of confusion.
Tiny slot that doesn’t go into threads = for removal tool
Large slot that goes through threads = self tapping
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I inserted them as the tutorial explained, slot side down for a cleaner finish
I believe these are meant to be installed with the slot up because you would use the tool for it.
But it didn’t come with a tool
Yeah they sell the tool in a kit. The ones you bought are extra pieces compatible with the tool. No big deal. Would’ve made removal way easier though
One’s i got are slot side up as well. The tool is a separate bit. Just like when you buy screws or nails they don’t come with a screwdriver or a hammer
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You don’t need the tool just put a nut on a cap socket screw and use that to install them. The nut will definitely make it easier
this… i used the flat head bit on my drill…slowly…on the first one and it eventually snapped the side of partially… still useable… then went back to a screw and nut
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This is what I did
You can also counter sink slightly
Did that as well 
I really think my deck is just brittle
Man. I tried loctite and super glue to get bolts in to pull these inserts out with no luck. Any other recommendations welcome 
https://www.toolspecialist.be/se05-screw-extractor-set-5-piece-teng?___store=be&gclid=EAIaIQobChMIp-HW8M6S4QIVSOh3Ch30TAXtEAQYBCABEgKSnvD_BwE Something like this may work if you can get your hands on them?
Damn! Epoxy will get it. This is mad frustrating. I can’t imagine how you feel lol
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Just want em out lol
Possibly a drill bit for removing bolts/screws where the head rips off. They have em cheap at harbor freight
5Pc SCREW EXTRACTOR SET Easy Out Drill Bits guide Broken Screws Bolt Remover Remove All Kinds of Broken Head Bolt Screw.
This is last resort yeah
Im actually mounting a case as we.speak… Using a slightly different insert… But… I found a 5/16 bit easier to get the insert in… The 1/4 im forcing.it.to go an it.wont easily… The other inserts (which i used on my other deck) have way better digging grip which may have attributed to splitting holes…
5/16 ended up being too big for my inserts. I wonder if I could just epoxy them in? Hmm