Dear colleagues!! I want to install a self bailer in my laser. Until now I have just used a rubber plug in the cockpit. But new self bailers, i see they have an screw which produce a hole in the hull. I'm worry because it could cause tha water come inside the hull. Is there any recomendation to do this job?. Is it better to install just with silicon?. Which is the maximun lenght of the screw if it must installed with screw?. Thanks for your help. Fair winds!!