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Products by Hartley Falbaum

Hartley Falbaum makes some very innovative, handy, and inexpensive products for sailplanes.  For fun he flies a DG-808C Competition.

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Falbaum Pseudo-Stud
(Glider Trailer Wheel Tool)

The Pseudo-Stud is designed to help with glider trailer wheel replacement.

Cobra and other European sailplane trailers use wheel bolts that screw into the wheel hub. That can make changing a trailer wheel a bit of a challenge, because after taking out 4 of the 5 bolts, the wheel is hanging on the last bolt - making it somewhat tough to rotate and remove the last bolt. When it is nearly all the way out, the weight of the wheel is pulling on a single turn of the threads on the bolt. Likewise, when putting the wheel back on, you need to hold the wheel up to the hub and insert and thread-in the first bolt while holding up the wheel. That is somewhat awkward because the wheel and tire are heavy.

Hartley cleverly created the Pseudo-Stud to make it easy to remove and re-mount the wheel. The first bolt is removed and the Pseudo-Stud is put in its place. Then when all the other bolts have been removed, the wheel can hang on the Pseudo-Stud. The Pseudo-Stud is small enough to fit through the bolt hole in the wheel, so you can easily slide the wheel off and hang the replacement wheel back on with the Pseudo-Stud still threaded-into the wheel hub. The Pseudo-Stud has a slight taper - to encourage the wheel toward the hub.

It is tougher to explain that it is to use. It really is handy!!! Every glider trailer owner should own one. They make great gifts too!

Printed instructions are included.


  • Jack-up the trailer
  • Rotate wheel so a bolt is at top-center
  • Set brake
  • Remove bolt and replace with Pseudo-Stud
  • Remove remaining bolts and the wheel won’t fall
  • Remove wheel
  • Replace wheel with spare
  • Insert other bolts - but not quite tight
  • Remove Pseudo-Stud
  • Insert remaining bolt
  • Tighten all bolts to 90 Nm (66 foot-pounds)


  • Length: 2.0 inches (51 mm)
  • Maximum Diameter: 0.61 inches (15.5 mm)
  • Diameter of outside of threads: 0.47 inches (12 mm)
  • Material: Steel
  • Weight: 2.1 ounces (59.5 grams)

metric ruler, the large
numbers are centimeters

metric ruler, the large
numbers are centimeters

$18 In Stock

Cumulus Soaring, Inc.
Paul E. Remde

8661 Connelly Place
Savage, Minnesota 55378

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