PAPA: Portable Aeronautics Physics Assembler
Assemble and disassemble Create Aeronautics physics structures with a handheld tool instead of placing/breaking Physics Assemblers all the time.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.21.1 on NeoForge. On other versions it may install and then do nothing.

This mod adds a handheld/tool version of Create Aeronautics' Physics Assembler. You can assemble and disassemble your honey-glued contraptions directly from your hotbar.
How it works
It's just one item, and it does exactly what you'd expect:
- Right-click a block: Assembles that block (and whatever is glued to it) into a physics object.
- Shift + Right-click a physics object: Disassembles it back into normal blocks, instantly snapping it to the nearest grid position and 90° rotation.
Under the hood, it uses the exact same server-side logic as the standard Aeronautics block, so the results are identical.
Crafting
Combine a normal Physics Assembler with two Sticks on a diagonal:

If you're in Creative, you'll find it in the Tools & Utilities tab.
Dev note: Unlike the physical block, this handheld tool snaps your physics contraption to the grid instantly when you disassemble. Since a held item doesn't have a tick loop, it skips the slow, multi-tick alignment animation the block usually does.
Requirements
This is an add-on, so you absolutely need Create Aeronautics installed to use it.
Modpacks
Feel free to use my mods in your modpack, just don't forget to give proper credit.
Other Mods by me
I run these mods together:
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as portable_physics_assembler-1.0.0.jar — drop this file into the mods folder
- Download size: 20 KB
- Download link checked 23 Aug 2026 — working
These come from our own check of the pack file, not from the source page.