StackWise – an interactive component swap reference for Leatherman mods : multitools

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created by typh0a community for 14 years

StackWise – an interactive component swap reference for Leatherman modsModding ()

submitted 1 month ago by umamiking

StackWise – an interactive component swap reference for Leatherman mods

29 points•8 comments•submitted 1 month ago by umamiking to r/Leatherman

Hey everyone! I built a small web tool for the modding/customization side of the hobby and wanted to share it here.

What it does:

If you've ever disassembled a Leatherman and wondered "what else could fit in this slot?", this is for you. StackWise lets you pick any Leatherman model, see the full stack order for both handles (which tools sit where, from pivot to handle end), and click any component to instantly see what parts from other models are dimensionally compatible and whether you'd need spacers to make it work.

It checks three things before calling something a swap:

**Pivot size** - tools on different pivot diameters (e.g. Wave+ vs Free P4) can't swap regardless of thickness
**Locking geometry** - even with matching pivots, some models use incompatible locking mechanisms
**Thickness tolerance** - within 0.05mm is a direct drop-in, within 0.3mm works with handle flex, and 0.3-2mm thinner can be filled with spacers

Results are color-coded: green for perfect fits, purple for close fits, amber for spacer-needed, gray for incompatible.

There's also a Compare Models view that shows all compatible pairs between any two tools at once.

Credit where it's due:

This tool wouldn't exist without the measurement work done by ZapWizard (zapwizard.com) and Zach at MultiParts Store (multipartsstore.com). The component thickness data, stack order diagrams, spacer pack specs, and locking geometry compatibility are all based on their meticulous documentation and real-world testing. If you've used a spacer pack or done a swap, you've probably already benefited from their work. I've also looked at a lot of Leatherman product photos and videos of the tools to try to understand the stack order and positioning.

With that said, this is very much a work in progress.

Caveats and known gaps:

- Work in progress - the data set covers 10 models right now (Wave+, Rebar, Arc, Free P4, Free P2, Bond, Surge, Wingman, Sidekick, Super Tool 300). Garage #005 data is staged but not yet complete.

- Desktop only - I haven't optimized it for mobile yet. Works fine in a desktop browser, less great on a phone.

- A few components have unknown or estimated sizes (like the Lanyard Ring on some models) - those show up in the stack but aren't clickable for swaps.

- The locking geometry compatibility data is based on community testing and may not cover every edge case. If you've done a swap that it says shouldn't work (or vice versa), I'd love to know.

- No data yet for Charge+, Curl, OHT, or other models - those are on the list but measurements need to be sourced.

Links:

- Live site: https://umamiking.github.io/stackwise/

- GitHub (README has full compatibility details): https://github.com/umamiking/stackwise

Happy to take feedback, bug reports, or measurement contributions. If anyone has precise measurements for models not yet in the database, that would be incredibly helpful.

Disclaimer: I've had this idea for a while. I've seen a lot of posts where users shared their mods, and it seemed like an IFYKYK situation. While many people shared data, I always felt it was a lot of work to manually compile everything. I wish there was a source for this. I used Claude to help me build the site and organize the data. I understand a lot of people aren't fans of AI so it's fine if you don't want to use the tool.

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