Get a 2" U bolt type exhaust clamp. Remove the nuts and pull the "saddle" piece off. thread the nuts all the way down the clamp. Put the "saddle" piece back on upside down (curved part facing outward). Insert this in the spring clamp and "loosen" the nuts on the U-bolt (one or two turns one each side, alternating back and forth) to press the spring clip out. Slip the clamp over the manifold/downpipe joint. Then "tighten" the u-bolt nuts to release the tension and allow the spring clamp to do it's job.