Some combinations of pieces are really hard to get apart – really hard. Can some answerers provide a list of “dangerous combos“? For example, a 2×2 with a round 2×2 on bottom. Also, if possible, provide a good way to get them apart!


10 Answers 10


A 1x1 round plate on the bottom of a 1x1 square plate is pretty difficult to get apart. The Santa's Workshop set uses transparent 1x1 round plates stuck until 1x1 plates with a clip on top to make Christmas lights. I just left the whole thing assembled; I'll probably never bother taking that apart.

Also: if you stick some brand-new 4x4 plates together it can be very very hard to separate them. Lots of clutch, lots of rigidity, so even with 5 brick separators it is difficult work.


My son did some extensive research on this subject, which yielded this beauty:

Light bulb stuck in Duplo stud

That’s a light bulb cover stuck into a Duplo stud. While it may look harmless, I found it impossible to get sufficient hold of the lightbulb before levering it out with a very thin screwdriver.

  • Would it help to use a plastic straw and some suction? – zovits Jan 16 '19 at 8:14
  • @zovits: I honestly don’t want to test this, but I strongly doubt that you can build up enough force for this. Also, you would have to find a straw that exactly fits around the light bulb. – Wrzlprmft Jan 16 '19 at 9:24

I'd say a 4265a on a 3649 are among the hardest to separate. But a 3647 is more painful due to the teeth

http://rebrickable.com/parts/3749 enter image description here

http://rebrickable.com/parts/4265a enter image description here

http://rebrickable.com/parts/3647 enter image description here


The Brick Separator can be employed successfully in a majority of cases where bricks are stuck together.

The hardest thing to remove I believe is Technic pins 4459 wherever used. See separate question.

  • 1
    When I was a kid I had 6 Technic sets that I loved and played a lot with. Those pesky pins without center slots would pull up a very strong fight.. but were always not enough for my child persistence :) I never had one pin broke down on me, I just loved too much those beautiful (for the time) Technic sets ! – Henrique de Sousa Sep 11 '19 at 23:29

A 1x1 tile stuck inside the bottom of a 2x4 brick is very difficult to get out. No Brick Separator will help you there.


Also, part 99009 and Part 99010 is another one that is extremely hard to disassemble as highlight in this question. (The current brick separator will not work in this situation.)

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  • Doesn't seem like a huge problem, since these are designed that way. The combination is effectively one part. – user253751 Mar 5 '20 at 14:15

Generally, early BIONICLE body bricks can encounter issues with this, due to their bulky, specially-designed nature. For instance, the Toa Mata body gearbox has a particular danger area inside it. If one places the #2 axle connector hub horizontally inside the neck area and sticks a 2-long axle in either side, the result is completely irreversible.

This is akin to some of the 'brick paradoxes' mentioned in this blog post, which I found linked in a question while browsing the tag selection a few days ago. There are plenty more to be found in Technic construction; after all, Bryson's Second Law of Repairs, a corollary of Murphy's Law, states: "If you fool around with a thing for very long you will screw it up."


I have a 3062b (round 1x1 open stud) stuck in the middle of a 6067 (boat mast section base 4x4) and I can't get it off. The round 1x1 fits over the post thingy in the center of the mast base and the side walls of the mast base prevent access to the grove at the bottom of the 1x1 round. The inner diameter of the mast base is small enough and tight enough that any antenna type pieces inserted through the bottom can't catch the lip at the top of the 1x1 round on the way through.

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Another inseparable part is theH-piece if you put enough of them together side by side many times


A 1x1 tile stuck to a 1x1 round plate was the hardest, I think harder than the accepted answer above, until I used two LEGO brick spectators in opposite directions. Put the stuck pieces on top of one separator facing north, pry with a second one facing south. Pops them apart beautifully.

Small plates stuck together can be separate using two LEGO separators, but both in the same direction.

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