ClickClack-what type of weedeater do you currently have? If it’s a cheap $99 one you bought at Walmart, then I would spend the extra money on a nice Stihl model (or Echo…I’m just biased towards Stihl because I have had great experiences with every piece of orange equipment I’ve bought).
Might check one of these two models out:
FS 55-R (Straight shafts work much better when using them upside down when edging)
http://www.stihlusa.com/products/trimmers-and-brushcutters/homeowner-trimmers/fs55r/If you already have a decent weedeater and don’t want to buy a new one….but you can’t do a good job edging with it, go buy one of these. I use mine for about 2 minutes each week. Make quick work and works flawlessly. Just keep the fuel fresh, use Sta-Bil or Star-Tron in the gas, change the spark plug every 2 years or so and these will last you for many many years!
FC-56
http://www.stihlusa.com/products/edgers/homeowner-edger/fc56ce/