Colin, i drilled out the original rivets. Then drilled a hole and tapped a couple but due to the nature of the alloy is tapped crap and bolts were loose on the threads. Could have tried riveting but theres nothing for the rivet to pull up to, like when you rivet a plate for example, would only be held by the force of the rivet against the sides of the drilled hole. just did a spot of weld in each hole