Sweet Potatoe Pie Filling

I am an excellent cook...not so great as a baker. I am attempting Sweet Potato pies again this year. I've been told that sweet potatoes are stringing, and in order to have a good pie you need to get the strings out of you mix. May question is what is the best method for removing string from your sweet potato mix? Thanks

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I usually use a hand-held mixer to remove strings from the sweet potatoes after they are cooked.