Ratfink, Frogslegs are the same as the old Speciality Racing Products "Mr Grumpy" brakes that I used to have; no vertical adjustment or toe-in adjustment as such. The brake blocks are on a plain shaft that clams into the brake arms with only rotary adjustment in 2 planes. Finer adjustment is somewhat crude .... you gently ( and very carefully ) bend the plain shaft so that the brake block ends up at the correct angle(s). Possibly best left to a LBS that has experience in setting up 'cross bikes ( maybe Paul Milnes if you are in Yorkshire). I now use Tektro 520/720 brakes which are very easy to set up in all planes.
Ian.







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