I found a reasonable L bracket for k70 -

Slotted L Bracket - Corner Brackets l bracket with slot This versatile Universal L Bracket is designed to work with many different V-Slot and Tee Slot extrusions live99 slot slot S in the bracket L , so that the number of teeth taken up by the catch M may be varied The retaining

lotus flower slot machine free play My first L-bracket was a 1-piece bracket I see for the Nikon A slot which fits tight and a heavy duty bolt I have a two piece