Tubus makes a machined aluminum clamp for forks with no braze on ,
which when fitted is quite solid..
but its still not a thru the fork type fitting
Tubus Tara with it's support hoop is long a favorite .
http://tubus.com/en/lowrider/tara
the hoopless double strut rack requires the struts be soundly mounted
on both sides , of both racks..
the hoop types are more forgiving.