Yttrium2
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On rubber stopper
Trying to find a rubber stopper that has a 12mm hole in the center,
I don’t want to buy a stopper borer, if I don’t have to, just the stopper. Additionally, I only need the one size..
Correct me if I’m wrong, but 12mm OD glass needs a 12mm hole, correct?
Would a tighter hole be better?
Don’t even know where to find a single 12mm stopper.
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Sulaiman
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A tighter hole is always better 
Something like https://www.ebay.co.uk/itm/173289539147?
CAUTION : Hobby Chemist, not Professional or even Amateur
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zed
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Buy the stopper borer. It only costs a few bucks, and you will find it infinitely useful.
A drill press can drill a hole in a frozen rubber stopper. But, the stopper borer is straight-forward.
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Yttrium2
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Not sure if this one can do 12mm holes,
it is 13 bucks
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Belowzero
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A regular steel or wood drill works quite well actually.
Just hold the stopper in your fist and use a small size drill first, then use a larger drill for whatever size you require.
Slowly work up to max speed to get a smooth hole.
Obviously this is slightly risky.
[Edited on 20-5-2021 by Belowzero]
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draculic acid69
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I've tried drilling rubber stoppers before and it's not an easy substance to drill.
Freezing is a must. Without Freezing it'll go to crap
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Oxy
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Stopper borer is a cheap and simple tool (DIY version may be made easily) but very useful.
I mostly use all-glass setups but there are some cases when there is a need to prepare a setup having 3 or 4 washing bottles. In such case a rubber
stopper with 2 holes and glass tubes (can be made from cheap Pasteur pipettes) is very handy as wash bottle can be made from any flask.
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