Useful Parts That Not a Lot of People Know About

[Lego David]

A topic where you can share parts that you think are very useful for MOCs, but most people don't even know about. It can be any part, from any era of LEGO, as long as you find it useful.

[MAB]

I imagine most people know about the parts I use in most MOCs.

I don't use these very often as I don't MOC cars much these days, but these are very useful especially if you use LEDs for headlights.

https://www.bricklink.com/v2/catalog/catalogitem.page?P=x85#T=S&O={"rpp":"500","iconly":0}

Expensive now, but well worth picking up a pair.

[Erik Leppen]

For, me, one of the most useful "unknown" parts is 50904, a Bionicle liftarm 8 x 3 x 2. It's one of those parts I wish they'd re-incarnate.

https://www.bricklink.com/v2/catalog/catalogitem.page?P=50904#T=C&C=86

With the half-width beams it's easy to integrate, with all the axleholes it's usually a strong connection, the central space can be used to host crossblocks or axles with gears, so it's very useful as a frame. I bought 8 on bricklink and keep using them in various MOCs.

 

[MAB]

Nice one. If I had ever tried to find that, I'd spend ages trying to find it in the technic section of BL.