I always struggle putting new line on my reels, espescially when I'm by myself. I always want to make sure it goes on correctly and evenly. I have the portable line spooler for use when I am at home, but I don't take it on the boat with me. Sure, it's easy enough to have a buddy grab a pen and hold the spool, but there is a new product that is just as easy and makes it a much faster process. I just got my hands on a new Berkley Mini Line Spooler and this thing is awesome.
The spooler clips on to the rod and has a nice tension handle to adjust it with a spin of the knob. I also line how small it is. I keep extra spools of my Seaguar fluoro and braid in my boat in case I need to re-spool while on the the water, and this new spooler will stay with them, ready to go when I need it.
Check it out, I think you will like it. Also, see the video demo of just how easy it is to use. The best part is it costs less than $5.00.