ᐅ How do you repair loose mortise and tenon joints?

Hello everyone,

Lately, I’ve been having recurring issues with loose Malm-type connections in my furniture. Specifically, these are the typical joints with wooden dowels and metal fittings that gradually become loose over time, causing the furniture to wobble or become unstable. I’m wondering what the best way is to repair these loose Malm connections without having to completely disassemble everything. Are there proven methods to tighten the joint again—perhaps using specific adhesives, filler materials, or mechanical aids? What mistakes should be avoided to ensure the repair remains stable? I would greatly appreciate a detailed explanation, as I want to repair my furniture myself rather than immediately calling a carpenter. Thanks in advance for any ideas and tips!

Hey Arifgo, that’s a great question! 🙂 Loose dowel joints can be really frustrating, especially when the piece of furniture wobbles because of it. My advice: first, clean everything thoroughly, meaning remove any old residue from the drill holes and the wooden dowels! Then I like to use wood glue, which swells a bit and fills small gaps—this adds extra strength. Important: don’t use too little glue, but also not too much, otherwise it will swell out and create a mess ;-)

If the joint is very loose already, sometimes it’s worth replacing the dowel or inserting a small piece of wood as filler to slightly enlarge the hole and create a tighter fit for the dowel.

Also, use clamps after gluing everything! This keeps the parts firmly together until the glue fully cures—which is absolutely essential!

And hey, keep at it! With a little patience, it will work out. Let us know how it goes for you! :-)

Wood glue is always the first choice. Remove old glue residues, slightly roughen the dowels, apply glue, and then clamp the pieces together firmly. If the holes are too large, gently scrape them out and fill with a mixture of wood glue and sawdust. Then reinsert the dowels. Do not use screws, as they can actually damage the joint.

Arifgo schrieb:
What mistakes should be avoided to ensure the repair remains stable?

A common mistake is only fixing the surface without properly stabilizing the internal joint. Neglecting leftover old glue, which reduces the contact area, also significantly weakens the stability.

I recommend carefully cleaning the drilled holes with the appropriate sandpaper and a small tool to remove glue residues, but without further damaging the wood.

Declan55 schrieb:
Wood glue swells slightly and fills small gaps – this adds extra strength.

Exactly, the swelling is an advantage, but large gaps should not be filled this way because mechanical support will be lacking.

If the drilled hole is already frayed or too large, using wood dowel repair kits containing small wooden pins and special fillers is a better option.

For pressing the joint together, a strong clamp is ideal to prevent movement and loosening over time.

In summary: clean, apply appropriate glue, use small repair dowels if needed, and clamp tightly for a secure connection.