Pretty well useless. Ended up doing by hand.

I have been using one for years. At first I was disappointed with the amount of effort it took to press grease into the bearings but I have found the bearing packer to be a faster and cleaner option than packing the bearings by hand and will use one if it is available. Be cautious when using a press on the packer. A buddy managed to break his so the grease zerk cannot be used to refill the packer.

Like one of the other reviewers stated...yeah you have to jump around and push your hardest to get the grease into the bearings. Using my hands to pack bearings works better, yet messy. Save your money and pass on this product.

Looking forward to somewhat cleaner hands at the next wheel bearing greasing.

Use a drill press or arbor press for leverage to force the grease and they work great

I have used these at a couple of different shops I worked at for several kinds of grease. A neat way to pack a bearing. Patience and hard pressure work well. If you use a bit lower of a bench you can get more of your weight on it to press. Once the grease comes out the top of the bearing you know you have it fully greased.

Save your money, unless you are using a thin grease you need to stand on and jump up and down on this thing to get any flow out.