To ensure the best playback of your vinyl, it's important to be sure that the record sits firmly on the platter. There are a number of solutions out there that range from inexpensive clamps to heavier metal weights.
We came across this great clamp solution from Clearaudio that slides over and grips the spindle on your turntable to keep the record flat against the platter. The lightweight plastic construction features an upturned edge, making it easy to remove.
It sells for $30 here on Audio Advisor. Here's a video review that explains the benefits and use of the Clever Clamp.