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@Dom
UK: http://www.sourcebmx.com/product/drivetrain/bmx-cranks/profile-no-boss-cranks/7090.shtml
I can only speak from experience here, but these spline drive (no boss) cranks have held up exceptionally well over the past two years with absolutely no issues ever. My girlfriend also runs the exact same cranks on her commuter daily and has never experienced anything coming loose.
The main problem is finding a spline drive front sprocket large enough for a reasonable gear ratio.