pbase_tab = 12;
pbase_thick = 4;
-inner_pbase_thick = 8;
+inner_pbase_thick = 12;
+inner_pbase_rad_mul = 3;
// computed
echo(inner_pbase_thick);
-inner_pbase_rad = arch_in_rad * 2;
+inner_pbase_rad = arch_in_rad * inner_pbase_rad_mul;
end_thick = arch_thick;