I think you are putting too much glue on the bushing before you insert them. We had the problem 2 weeks ago with 2 on the same boat. The first one wouldn't stay in the hole. We would beat it down with the wooden block and we could watch it just push itself back out of the hole. The second one when we hammered it in it held onto the block. If you put too much glue then it heats up and expands the plastic. We had to sand the inside of the bushing down to get a seat in and out of it