A spool of thread is very cheap. Spools of thread can be as cheap as a dollar or less a spool.
More than narrow tread tires.
3yd - 1 feet
That depends on how much line is on the spool, if the spool is empty then each turn retrieves less line then when it is nearly full.
Spool pins are used on sewing machines to hold the spool of thread. Most or vertical, some that are horizontal use a spool cap to secure the spool of thread. Some machine come with spool nets to cover the spool to ensure the thread enter the machine evenly. Some machines come with an extra spool pin that fits into a small hole on the top of the machine to hold a second spool of thread.
A typical automotive vehicle legal tread depth is 2/32", which isn't much.
That spool is just the right size for my project.
A real reel is a genuine spool.
Emma Spool was created in 1982.
Increases grip if there is water on the roadway the water can enter the holes in the tread and not interfere as much with the rubber contact with the road.
To wind a Ryobi weed wacker spool, first remove the spool from the trimmer. Then, wind the trimmer line around the spool in the direction indicated on the spool. Make sure to evenly distribute the line and avoid overlapping. Finally, reattach the spool to the trimmer and you're ready to use it.
If you are talking about a diff. A mini spool replaces the planetary gears in the diff centre. A full spool replaces the whole centre except the crown wheel.
To change the spool on an RTE 115 trimmer, first, ensure the trimmer is turned off and unplugged for safety. Remove the old spool by pressing the release tabs on the spool cover and lifting it off. Then, insert a new spool by aligning it with the spool holder and ensuring the line feeds through the eyelets. Finally, replace the spool cover securely, and the trimmer is ready for use.