a pocket knife and a magicyoyo n9.
knife picks knots, cuts strings and generally does a lot of things, n9’s hubstacks are PERFECT for removing C size bearings (try it, i know you want to ;D )
I use an unbent paper clip to take out knots
I love the Totalartist holder. 
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bearings are optional. you can always play fixed axle.
string- ya need.
response- ya need
i would consider stacks an accessory. an IRG would also be an accessory. other than that… i don’t know.
I really like the YYE leather yo-yo holders I make, especially the one with gold spikes (thanks guys). But, that YYF multi-tool is great too, it definitely comes in handy. And, if your throw is not wing shaped, get yourself an Ooch holder…love those. I got a cozy from a friend at Mass States, very neat concept, I will be trying it out.
yyf tool, v4m lube, crucial/ twisted triefcta, acetone, yye forms