If you make small oil samples this little tool is a lifesaver! Those tiny orifice reducers are difficult to snap into place. This is called the “o,pressto” and it’s ingenious! You put your bottle with the reducer in it and push down the wood lever handle. No sore fingers or palms. Yay! I think I purchased it at @oil.life.
For bigger bottles and rollers you can use the lid to both secure and remove the produce reducer. To secure, just add the reducer to the bottle then twist the lid in place to you feel the reducer pop in. To remove, unscrew the cap half way, tilt it, then use the edge of the cap to pry out the reducer.