-cppS = cppJ + [0,-1] * catch_len;
-cppD = [ cppA[0], cppS[1] + catch_slop ];
-cppC = [ cppB[0], cppD[1] ];
-cppT = cppS + [1,0] * catch_depth;
-cppU = cppT + [0,-1] * catch_height;
-cppV = [ cppS[0], cppU[1] - catch_depth ];
-
-cppR = 0.5*(cppP + cppJ);
-
-cp_rQ = 0.5 * (cppJ[0] - cppP[0]);
-cppQ = [ cppR[0],
- cppV[1] - (catch_finger_height - cp_rQ) ];
-cppF = [ cppV[0] + catch_finger_depth, cppC[1] ];
+cppA = epp4 + [thumbrecess_depth, 0];
+cppB = [ cppA[0], epp1[1] ];