Ive been doing a lot of 3d printing with the Stem system but never thought of doing it like this untill after I saw this thread. Some really cool ideas in here. So I thought I would try it with the aoda little. Yes it will stem. No you should not do it. 
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This also applies to the undersized models. The custom reactor with a thin bearing makes for a great modern responsive.
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Not to mentionā¦ those Customs just look super cool like that!!
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I need to get a reactor and chain reactor at some point before customer sells them all.
I got my axl collection finished but never went for the undersized models
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They do look amazing. It always makes me happy to see Customs yoyos being discussed. My first āniceā throw was Custom Mag that I got from a Mall Cart. Brings back great memories.
Now, slightly off topic, but I need a Ti Axl Elite to happenā¦
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That would be epic. Only way custom would do it is if someone was willing to do the design work and order a batch to sell and just use them for machining and even then probably would have to use a different name.
Like they arenāt gonna say no to money and an order that meets their minimum and is willing to pay the machining cost but it wonāt be cheapā¦
At the same time it didnāt sound like they are in the business of really doing YoYo stuff anymore directly. Itās just dead stock for them.
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@Knarknar confirms that the Proyo Ace will STEM. (Did Custom manufacture those? I know they manufactured the Cold Fusion parts, so Iād assume?)
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Will it stem? Yes but will it spin?
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Can someone try the a stem on a mini banshee? If not i may have to order and testā¦ 
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Howād ya manage that!? Thatās sick!
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Here the ace 1 this little guy rips now! Itās a modern spr mod is what it feels like
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Yeah if thereās a lip itās a no go.
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What is the point of putting stem kits into modern unresponsive yoyos?
Make it wider
Or
Cause we can
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I think thereās two potentials.
#1 - You can make it wider for a little easier string catch or just because
#2 - You ever want to play a Bear Trap with an A sized bearing in it? Nowās your chance!
Thought of one more
If you pop a D-Bearing kit on a Stale Bread, did you just make a Moldy Bread?
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I appreciate the attenpt but thats a mini coveyā¦ mini banshee is a C bearing, thats why Im curious to see if the stem fits. Thing would probably be so good with an a bearing 
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Youuuuuu, are correct! Haha, grabbed the wrong one, whoops.
The Mini Banshee does look to still have a tad bit of a lip on it unfortunately (grabbed the right one this time, lol).
Almost though!
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I believe that only the C kit truly works with existing non-stem yoyos.
Here are the a, c, and d seats next to each other. In the a and d kits, the bearing actually sits on the stem itself, whereas the c seat has a secondary ring for the bearing to rest on.
EDIT: Of course, if you could make some axle sleevesā¦
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