simple, just having it in our mind picture of the 1st, instead of the 2nd for the "normal" common ones, below - silencer (https://en.wikipedia.org/wiki/Silence

simple, just having it in our mind picture of the 1st, instead of the 2nd for the "normal" common ones, below - silencer (https://en.wikipedia.org/wiki/Silencer_(firearm) https://en.wikipedia.org/wiki/Silencer_(firearm)) - finger ring so aggravating stumbling block is it can't almost even be found a gearing puller to pull it in such condition as the push contact is rather too 'hidden' or deep inside it, at least in my country haven't found such fulfilling tool in search for a day or so