I have a C gearbox on my 582. I have to remove one of the 11 bolts holding the two halves of the gearbox case together.

Why? Because, apparently, a previous owner installed the large radiator and cushion clamped it to one of the gearbox screws. I have to remove the gearbox screw so that I can move the water hose from in front of the lower gearbox fluid level check screw so that I can remove it in order to check the gearbox oil level.

If that's not bad enough, I had to remove the prop in order to get to the gearbox bolt.

The Rotax IPC and Lockwood's website both give this description of the gearbox bolt: ALLEN SCREW M6X30 DIN 912.

Question: What size Allen wrench should that take?
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