I was talking with the owner of a Pacific 38 who is about to head offshore, about how to secure the hatch and slides so that they can be opened from both sides. I couldn't quite remember how I had done it, so when I was down at the boat today I took a photo of my solution. A clip at each end of a bit of spectra which passes through an eye on the hatch allows release from the inside and out and secures everything, while also being simple and at minimum cost. IF someone knows the P38 owner then please pass this on.