Is there a plate in there before the bolts or are they bolted straight into the core? I’d suggest a spacer.
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I haven’t manage to get spacers for now, Dicky suggested the same thing when I showed him the photo 
Is it recommended due to the vibrations causing the bolt to loosen up?
You just need to spread the load so that the core doesn’t get damaged.
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What tool do you guys use for these pulleys? Arbor press?
No just your hands.
Holy gorilla grip Batman.
Is it supposed to be flushed all the way? I have well had bkb pulleys on mine before and I can’t get it to go all the way in.
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With kegel I didn’t have any issues. It is plastic-metal contact
Sometimes I use another wheel and hammer it in like a rubber mallet. Might be frowned upon…
The only one I’ve found I couldn’t get the bearing into ny hand was the 3d servitas one. Which is a good thing.
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This is exactly what I did. 
Edit:
I actually did use a rubber mallet.
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Get a socket that matches the size or the outer race of your bearing. Pop the bearing in the freezer for 10 mins and then tap it in. Tap tap tap it in.
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Share as in not overtightening any one of the nut over the rest is it?
I tighten them up until i feel a resistance and then go around tightening all 5 bolt a little bit more so I guess that’s even?
If anyone has an extra BKB kegel pulley, lmk
Tested out on a 20 km ride yesterday and none of the bolt/nut came loose so I believe it’s all good
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There may be another option comeing soon!
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The wheels you have are classified as clone abec wheels so you need pulleys that fit clone abec wheels.
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Thank you for your help! I will look for where to buy.
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Just to confirm the only thing keeping the pulley on the wheel is friction, right? Friction inside the hub and friction between the pulley and the bearing.
There isn’t an inner lip inside the pulley that the bearing can grab onto?