Installation of the Jabiru engine mount is known to be tricky.
And it got trickier: the bottom, passenger side bolt now has even less clearance for the nut installation.
The picture above shows, on the left, my engine (3300, 4th gen). I had to put the nut in place with long tweezers and slowly rotate until the thread engaged; then I used an open wrench to tighten (a box wrench would not fit).
On the right is a screen grab from the HobuildersHelp video, showing a much larger clearance: one can even use his/her fingers to put the nut in place... (the video was done before gen 4 was announced).

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Comment by John Austin on January 9, 2019 at 9:20pm

I bought a "crowsfoot" clamp (like a C-clamp but with 2 "feet" on one end) at Lowes, slightly modified the two "feet" to slip past the washer and contact the rubber engine mount.  I then used the clamp to compress the rubber engine mounts, making starting the metal lock-nut much easier.



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