3D printed accessories for hassle-free astrophotography

Made in Germany, shipped from Germany

Thread wrench for stuck extenders and adapters used in astrophotography

Wrench set for extenders and adapters

(use the arrows on the left and right sides in the middle of the frame to scroll through pictures)

Did you already try to loosen a stuck 3mm extender ring from a filter wheel? If yes, you already know that it is close to impossible. I did too, but only once. Just after that, I designed this wrench set.

It consists of a flat bracket wrench which is similar to the ones you can buy for photographic filters. This one is good for simple cases. Another one consists of two parts that can be tightened together by two screws. It is less handy but can help in more difficult cases. In worst cases, you should add a bit of adhesive PVC tape.


  • a flat bracket wrench
  • a pair of wrenches with tightening screws

If you have questions, feedback or suggestions for custom changes, please contact us using this form.

2 in stock (can be backordered)


VAT exempted according to UStG ยง19
Delivery Time: ca. 3-4 workdays
Additional costs (e.g. for customs or taxes) may occur when shipping to non-EU countries.

2 in stock (can be backordered)

the diameter of the tube you need this wrench set for, in mm