Wood Trick Oil Derrick Rig Toy - Oil Pump Jack Mechanical Model to Build - 3D Wooden Puzzle, Assembly Toys - STEM Toys for Boys and Girls

Fun to assemble like all the other wood trick puzzles I’ve purchased

This takes some effort to build, it’s definitely for adults. You also use a lot of sharp toothpicks to keep the parts together (no glue!) and so you have to be very careful you don’t stab yourself trying to push toothpicks through the holes. Using needle nose pliers helps a lot to avoid injury.Also, you have to sand the gears and wax them well as you’re building to make sure everything functions. It’s very hard to reverse mistakes so go slow. Overall, it was well worth it and when I operate it its extremely cool!! This is very well made too, not a cheap Chinese product and the parts are laser cut. I was so impressed I bought another product from them.

This was fun but very challenging to assemble. We assembled 3 they looked just like picture. The only reason for 4 stars is that we could only get one of them to work when we turned the crank.

This had to be one of the most fun puzzles to build, it didn't take long but all the gears and different assembly things made it super fun and the best thing of all is that it really works. If anyone you know is into these wooden puzzles this is a must have. A++++

One of the easier models my teenage son has put together. We did add a little glue because the pieces were loose and we planned to Mail it across country.

Loves this

I purchased this for my 4 year old because he wanted me to build it for him so he could have an oil rig to place by his train tracks. Let's just say this is the 3rd one I have purchased because the wood is flimsy and it will break. Once the wood breaks, you are out of luck. If you want to continue, then you will need to purchase another. Having said that, with each purchase, I worked smarter and not harder. Here are a few tips that I highly recommend to avoid battering your hands and fingers, or poking holes that will bleed in your fingers.1) Do not use the sandpaper. Invest in an electric nail file that they use at nail salons and plug it in and sand the toothpicks this way. Do NOT try to sand this by hand and then push through the holes. You will hurt yourself and you will waste so much time. SO much time.2) Do NOT use broken or splintered pieces. It will not work. Your rig will fall apart and youll be pretty upset you wasted time on this.3) Use the paraffin. Grease those gears.4) Pay close attention to the small details in the instructions (which are photos by the way). If you miss a small detail such as a hole should be facing down instead of up, you are screwed.Personally, I will never buy one of these again.If you want to upset someone, send them this as a gift. They will injure their fingers attempting to put it together, and most likely, will need to buy a few before they can actually complete one. I have not finished it yet. I had to go backwards and redo some stuff (pay attention to those instructions lol).....and give my fingers a little rest. I will finish it up because my sweet little guy will not let me burn it in the fireplace (I asked him if it would be cool to set it on fire instead... he laughed and said no). I am sure the end result will be nice, however it just isn't fun for me. In any case, give it a shot if you want an oil rig since they don't make toy oil rigs. LOL.Update: Ok, so as I progress with this nightmare of a product, please know the instructions are off. For example, when it asks you to locate #38, there is no 38. It's actually 8.....I checked with my other one as well, and it's the same.Also, the holes you are supposed to place the pieces in are waaaaay off. It's annoying because it shouldn't be so difficult. I am making great progress (though frustrating and painful on the fingers) and then suddenly the holes don't line up and I am ANNOYED and now have to think of how to correct this issue. Buy a better brand.

I have built various wooden puzzles and models and this was first time trying Wood Trick. It was a disappointment. Tolerances are off, holes are unnecessarily tight. Especially trying to fit all those toothpicks in. Like just why? The pieces could still fit without glue if they had just made holes slightly larger. Would save so much time and frustration and the risk of poking yourself with the toothpicks. Even after sanding and waxing every part really well, the mechanism didn't run on its own with the rubber bands; the tolerances make it unlikely to happen. The good thing is the main shaft of the mechanism is visible on the back side, so I was able to make a small hand crank from some spare parts and glue it on, which was good way to make the oil rig move manually still better than nothing.