Quick Answer

Loose Nendoroid parts are usually caused by worn peg holes, softened plastic from heat or handling, or repeated assembly cycles. You can fix most loose joints with a thin layer of clear nail polish or floor polish on the peg, then let it dry before reattaching. For persistent looseness, consider a tiny dab of museum putty on the joint surface.

Why Nendoroid Parts Get Loose

Nendoroids use small PVC pegs and ball joints that fit into corresponding holes. Over time, the PVC can soften slightly from room temperature changes, repeated posing, or the natural aging of the plastic. The peg itself may also wear down if you frequently swap parts between different Nendoroid bodies. This is not a defect — it is a normal characteristic of the material.

Another common cause is improper storage. If a Nendoroid is left in direct sunlight or near a heat source, the PVC can become pliable and lose its original grip. Similarly, storing a figure with parts tightly compressed inside a box can deform the pegs permanently.

Safe DIY Fixes for Loose Joints

The most widely recommended fix among collectors is applying a thin layer of clear nail polish to the peg or ball joint. Let it dry completely for 24 hours before reattaching the part. This adds a microscopic layer that restores friction without damaging the plastic. Avoid using superglue — it can fuse the parts permanently or cloud the clear plastic.

For very loose joints that nail polish cannot fix, a tiny dab of museum putty (also called quake hold or poster putty) on the joint surface can add grip. This is especially useful for Nendoroid stands where the figure keeps slipping off. The putty leaves no residue and can be removed easily.

If the hole itself is stretched out, you can try the floor polish method: dip the peg into a clear acrylic floor polish (like Pledge Floor Gloss), let it dry, then reassemble. This works similarly to nail polish but is slightly thicker and more durable.

When to Stop and Replace Parts

If a peg is visibly cracked, bent, or has broken off inside the hole, do not attempt a DIY fix. In that case, the safest option is to order a replacement part from Good Smile Company's parts service or check second-hand markets for loose Nendoroid parts. Attempting to glue a broken peg inside a hole can ruin the entire figure.

Also stop if you notice any white stress marks around the joint — that indicates the plastic is about to crack. At that point, discontinue posing that area and consider displaying the figure in a static pose that does not stress the joint.

Prevention Tips for Future Nendoroids

To keep your Nendoroid joints tight longer, avoid frequent part swapping on the same figure. If you like to change poses often, consider buying a second Nendoroid of the same character to share the wear. Store your Nendoroids in a cool, shaded place away from windows and heating vents.

When displaying, use the included stand and base even if the figure can stand on its own. The stand takes weight off the leg joints and prevents them from loosening prematurely. For Nendoroids with heavy accessories (like large weapons or extra hair parts), always use the stand arm to support the extra weight.

Diagnosis: Is Your Nendoroid Part Loose?

  • Symptom: The arm, leg, or head piece falls off easily or wobbles when attached. The figure cannot hold a pose without the stand. Check if the peg or the hole is the source of looseness.
  • Likely Cause: Worn peg from repeated swaps, softened PVC from heat or age, or a slightly stretched hole from over-insertion. Avoid heat exposure and limit part swapping on one figure.
  • Corrective Action: Apply a thin layer of clear nail polish to the peg, let it dry 24 hours, then test. If still loose, try floor polish or a tiny dab of museum putty. Never use superglue. Stop if the plastic shows cracks or stress marks.
  • Stop / Replace Point: If the peg is cracked, broken, or the hole has visible stress marks, stop DIY fixes. Order a replacement part from Good Smile Company or a parts reseller. Display the figure in a static pose until the replacement arrives.

Nendoroid That Benefits From These Tips

  • [Pre-order] UmaMusume: Pretty Derby - Daiwa Scarlet & Gold Ship Nendoroid Good Smile Company: This set includes two Nendoroids (Daiwa Scarlet and Gold Ship) from UmaMusume: Pretty Derby, made of PVC and ABS, each approximately 100mm tall. Pre-order closes September 2026, with US arrival in March 2027. Two Nendoroids in one box means more parts to pose and swap, so the joint-care advice above is especially useful for keeping both figures display-ready over time.