I'd suggest making or purchasing a beam. I use a round one. You want a beam that is smooth. No knots or cracked fenceposts. 5911ryan has a good beam making video if your a DIY kinda guy. I really like my Ron Post 2 handed fleasher. One side is dull and smooth. Other is sharp for those tough spots on beaver and badger. It's pricey but you do get what you pay for. I've seen guys make them out if flat bar steel and are proficient. It's not all the tool just how you use it.
I tell the old lady that... she says I need more practice
Bill