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I would think that it would be called the pen cap or the cap of a pen. Top of the pen or pen top may also be used. But I don't really believe that the lid of a pen is the correct use of the word "lid" in the phrase.
The tip of the pen is the top because that's where you would put the pen cap
The opposite end to where the pen would write
The spy pen can take pictures by clicking the top of the pen.
The spring needs to be inside, it's purpose is to to force the battery(ies) to meet the cap. It is not too difficult to insert batteries in it, even if the pen requires several flat batteries. You just have to insert a battery, one at a time, then keep your finger on the battery, to keep it from dropping. Then you slid another battery under your finger. You repeat this until all required batteries are in the pen. Keep holding your finger on top of the opening. Then comes the tricky part: you have to slid the cap from side on the battery, replacing your finger. If this does not work for you, you can use the blade of a knife to hold the batteries in, flat on top of the tube, and then let the cap slide in and the knife-blade slip out. Do notice, that all the flat batteries have to be oriented same way. Most commongly flat side towards the cap and the 'bump' towards the tip of the pen.
The spring needs to be inside, it's purpose is to to force the battery(ies) to meet the cap. It is not too difficult to insert batteries in it, even if the pen requires several flat batteries. You just have to insert a battery, one at a time, then keep your finger on the battery, to keep it from dropping. Then you slid another battery under your finger. You repeat this until all required batteries are in the pen. Keep holding your finger on top of the opening. Then comes the tricky part: you have to slid the cap from side on the battery, replacing your finger. If this does not work for you, you can use the blade of a knife to hold the batteries in, flat on top of the tube, and then let the cap slide in and the knife-blade slip out. Do notice, that all the flat batteries have to be oriented same way. Most commongly flat side towards the cap and the 'bump' towards the tip of the pen.
Top i think
Top if cap to bottle and hat if a head cap
Cap- means on top of or the head.
when we pressed the top of the pen,it pressed the pen ink inside down causing the spring to be compressed and the pen will come out
when we pressed the top of the pen,it pressed the pen ink inside down causing the spring to be compressed and the pen will come out
Depending on how it is used it can be a hat or a top of a bottle, or a part on a car called a distributor cap. A lid or cover, or to place a limit on an activity, prices, or expenses. A cap gun toy for children.