For this K&M 17513B multi-guitar stand;
K&M / Guardian 3 Guitar Stand for 3 Guitars
Here’s a simple tip for anyone experiencing wobbling legs when the stand is on a flat floor. You’ll only need a flat surface or table to easily try this out yourself. This method works for other Guardian Series guitar stands as well.
Here are the K&M Guardian Series stands for your reference:
K&M / 17513 Guardian 3 Guitar Stand for 3 Guitars
K&M / 17515 Guardian 5 Guitar Stand for 5 Guitars
K&M / 17515B Guardian 5 Guitar Stand for 5 Guitars
K&M / 17525 Guardian 5 Guitar Stand for 5 Electric Guitars/Basses
K&M / 17534 Guadian3+1 for 4 Guitars
Since K&M Guardian Series products are made of plastic, slight warping can occur over time, leading to wobbles in some cases.
This method is a legitimate adjustment technique from K&M, so feel free to give it a try if you’re experiencing this issue.
Here is a tip for adjustment K&M recommends.

K&M is based in Germany, so the manual is in German, but here’s a Japanese translation (directly translated for reference). The instructions may have some difficult points to understand in translation, but I’ll break down the specific steps below to make it clearer.
Guardian Multi-Guitar Stand: Secure, Wobble-Free Setup on Flat Surfaces
■ Getting Started
The Guardian model base is designed for minor adjustments to ensure a wobble-free stand.
■ Example Scenario: Legs ‘a’ and ‘b’ are in contact with the floor, while one of legs ‘c’ or ‘d’ is also in contact, leaving the remaining leg slightly elevated from the ground. As a result, a pivot point forms around the contact line ‘a-b’, causing the Guardian stand to wobble.
■ Fixing the Wobble
Place the Guardian stand on a table or flat platform, allowing one of the wobbling legs to extend freely past the table edge. Press down on the rear leg (in this example, leg ‘c’) towards the tabletop and apply gentle pressure to the exposed leg (in this case, leg ‘d’).
Alternatively, to put pressure on both wobbling legs, place a low object (about 10mm) under one of the fixed legs (like legs ‘a’ or ‘b’) as needed.
Now let’s try it out.
On this test stand, the left front leg (leg ‘d’ as shown in the manual example) is slightly lifted.
*When placed on a flat surface


Following the manual instructions, place the wobbly leg (left front/‘d’) off the edge of the setup platform and gently apply downward pressure on the opposite legs at the same time. Use both hands to press the diagonal legs lightly, applying a bit of body weight as needed. Repeat this until the wobble is completely gone.
*Lift the leg off the platform

*Apply pressure along with the opposite diagonal leg

In this case, pressing down for about five seconds three times was enough to eliminate the wobble entirely.
The raised leg now sits perfectly flat, eliminating any wobble on a level surface.
*Wobbling has been eliminated on a flat surface


And that’s it!
It’s a very simple fix, so I hope this helps any users facing a similar issue.