Ryobi P2002 manual

have you read your operators manual.? They generally just unclip and pull out.

Once you remove the spool cap and the spool, you cannot remove the head from the motor. It is not a replacement part.
Ryobi P2002 Cordless String Trimmer Parts

Check to make sure you don't have a staple stuck under the hammer. If the spring feed is working, then something is keeping the staples from sliding under the hammer. Can you hear the hammer hitting? Does it leave an impression on the wood?

When looking at the head, you will see to two gray rectangle pieces. Press them both at the same time between your thumb and forefinger and then pull. It should come unlatched and reveal the line spool on the inside

full throttle, tap on ground, line should feed automaticaly.

Ryobi Trimmers unscrew halfway down the shaft (so it fits in the box). If this gets loose, the trimmer will stop working. Simply tighten the connection between the upper and lower half.

the wiring maybe disconnected, either at the switch or down near the head of the trimmer

In the US hardware stores (DIY stores) or stores that sell car parts. Bring the old one in so that you can match the numbers. Also you will need to set the gap. that is the space that the spark goes across. It should have that number in the manual. I can tell you because we use thousandths of an inch. in the US.

Yes, and charge it up occasionally to keep it alive. Lithium batteries are costly and severe cold is not good for any type of battery.