A number of years ago I bought a brand new mushroom anchor, went to the lake and got it stuck. I grabbed hold of the line and gave a big pull and the man with me started screaming your gonna sink us ! I looked and I had pulled the corner of the boat under. We were in 40 feet of water and I wasn't about to try and swim for it so there was not a thing to do but cut the line and leave it.. I no longer buy anchors. I have found a cheep replacement that IMO works better. I go to the local scrap metal yard with tool box in hand and remove the flywheels off riding lawn mower engines. Take them home and put an "I" bolt, a washer and a nylon lock nut on em. Works far far better than the mushrooms ever did and at no real cost. BTW, I use only a single nut on the "I" bolt because I like the bolt to point to the boat and not stand up straight so its harder for the wind and boat wakes to break the seal.