Removing FSA SLK chainset

Left hand crank looks like this:

Do I need a special tool to remove the outer washer-thing (the bit with 6 small holes)?
I can undo the hex bolt a bit, but it quickly becomes tight again and I don't want to force it. Not sure if the outer bit is screwed in or just a snug push fit.
Thanks.

Do I need a special tool to remove the outer washer-thing (the bit with 6 small holes)?
I can undo the hex bolt a bit, but it quickly becomes tight again and I don't want to force it. Not sure if the outer bit is screwed in or just a snug push fit.
Thanks.
More problems but still living....
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Keep undoing it and the crank will just pop off, basically you have an integrated crank puller there! The washer with the six holes means as you unscrew the bolt it pulls the crank off the axle.
Carbon 456
456 lefty
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White Inbred