different adjustment for setting the angle of blade 14 will be described later referring now to fig3 and 4 the floating blade assembly 24 includes pivot angle blocks 18 at each end of the mounting block 16 these pivot angle blocks 18 are mounted to the mounting block 16 by means of circular cross section pins 47 which permit pivotal rotation of the mounting block 16 relative to the pivot angle blocks 18 about an axis of rotation 46 as best shown in fig9 the pivot angle blocks 18 are mounted to the frame 12 via bolts 48 see fig1 which are threaded into bolt holes 50 in the pivot angle blocks 18 so the pivot angle blocks 18 are stationary relative to the frame 12 the frame 12 rests on top of the ice and the pivot angle blocks 18 are securely attached to the frame 12 so they are not allowed to move relative to the frame 12 however the floating blade assembly 24 is pivotably mounted to the pivot angle blocks 18 such that the blade 14 may be moved from a first position in which its bottom surface is substantially coplanar with the surface of the ice 52 see fig3 to a second position see fig9 wherein the bottom surface of the blade 14 is at.