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They are very fun to run. It's tail heavy so it jumps and lands well. The arm is glued on not bolted. Make sure to use a strong glue such as plastic bond which melts the pieces together.

Imo it’s a super cheesy way to do it, but there are these on eBay

https://www.ebay.com/itm/12mm-HEX-Adapter-4pcs-for-TAMIYA-Grasshopper-Hornet-Frog-Wild-One-Grasshopper-2-/284387842247?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0

Yeah Racing HPI Sprint 2 CVD dogbones connect nicely to the Tamiya Frog CVD axles. I would like the Yeah Racing dogbones to be a few mm longer but I can deal with this. It all meshes nicely with the Associated outdrives.
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