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Hallo people 
Just thought I'd give you a bit of advice on using the ER-20s!
Generally I do and recommend the following;
First clean your ears out with a cotton wool bud, don't insert too deeply. People say not to do this but if you're careful (emphasis on careful) there's no problem. Don't go jamming the bud in deep, don't do it while driving/trampolining, don't do it while someone is likely to sneak up on you.
While you're cleaning your ears out, let go of the cotton wool bud and pay attention to the angle it sits at (make sure it's inserted around 1 - 1.5cm at the time). This is the angle you should insert the earplugs at.
Before you insert the earplugs lubricate them slightly. This is very important and often overlooked by people but it makes it much easier to insert them and achieves a better seal.
I recommend good old fashioned saliva, available from any mouth. Don't spit on them, and don't work up a great big greenie, you just need to lick them slightly (or if you're like me and don't like the taste of earwax lick your fingers then rub the saliva around the silicone tips).
When inserting them you should do so slowly and carefully, you might need a slight twisting motion, but the #1 thing that helps me here is to let your ear guide them in rather than grip them forcefully with your thumb and forefinger and shove them in. Hold them gently and "put your ear over the earplug" so to speak, rather than insert them in your ear. This way they'll move to suit your earcanal shape.
If at any time you experience pain or irritation, REMOVE them and wait for your ears to stop hurting. If this happens you're most likely doing something wrong. Don't charge on like a trooper and 'take the pain' (this is what I did the first time I used them, without lubrication, and my ears hurt for 3 days afterwards).
Depth is a tricky one and varies from person to person. I actually insert mine quite deep to the point where the very tip of the plastic barrel is about 1-2mm outside the little flap of skin at the front side of my earhole.
DO NOT INSERT THEM TOO DEEPLY, you will not be able to remove them. Not inserting them far enough will yield poor results and you won't get much isolation so EXPERIMENTATION is the key
It's normal to take a while to get used to them as well, but you should after time be able to insert and remove them in seconds, and while using them you'll forget you even have them in if you do it properly.
You'll find that when you insert them deeply they can be difficult to remove when your hands get sweaty, so if you're DJing and need to remove them now and then simply don't insert them too deep. Otherwise I use my shirt or a cloth to grip them.
When removing them use a slight twisting motion and do NOT remove them rapidly as the pressure may hurt. It's unlikely to cause damage, but pain isn't always fun.
Make sure you clean them after each use, remove any earwax from the flanges and clean down the tip a little with something soft.
It's not unusual for the silicone to turn yellow after prolonged use, this doesn't effect the performance in any way but it does look a bit icky.
Do NOT think of clipping off the plastic barrel, this not only makes them very difficult or impossible to remove but it is in fact the resonating chamber that makes the earplugs what they are, clipping it off will render them useless (and unsafe).
It's normal after heavy use for the silicone tip to become detatched now and then, so if you're using them frequently make sure the silicone is firmly pushed back onto the plastic. If you go to remove them and find a piece of plastic in your hand and the silicone still in your ears do NOT panic, it's easy to remove - get someone else to do it if you can, otherwise use a mirror. It just requires some care and common sense really.
If you've got any questions feel free to ask away, PM or icq me
And btw, thanks heaps for your support 
Marcus/Snufkin
Headphonic Australia
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