As per the instructions in the manual. I go one step further and mark where the cowl mount blocks will go. Then, take a chisel or blade and scrape off the coating of sealant, what ever it may be, that protects the firewall from fuel damage. That way the epoxy is biting to the wood and not just glued on to the sealant. I also sand them to the curve of the cowl in the area where they are to be placed. Once glued and cured, seal them with polyurethane.

The instructions to mark the cowl for cut outs and hole placement of the mounting screws is the slickest trick in print. I often went nuts trying to transfer locations on to the cowl and it took 'Great Planes' to figure it out. I've used that method on every model since. I like to use small dowels around the hub to use as spacers against the inside of the hole of the prop opening.

Last but not least is a little device from PSP manufacturing. Cowl binders, been using these for over two years now and they are great. CNC machined neoprene, mated pieces, one male, one female that snap together and clamp the cowl forming a durable collar for the screw and rubber washer to pass through to secure the cowl fast. Never comes loose and will not chew a big hole around the screw from vibration.

www.pspmfg.com Pack of six for about $3.00 These are a 'must have' item. I tried every trick in the book to hold a cowl on, always with the same results. They would hold for a while, some methods longer than others, but in the end, the fastener would end up eating the holes bigger from vibration. Good luck with your radio, Joe