While I have my Strikeback Growler alarm fitted, I thought that I would look for a more secure locking solution for my Hymer B644 sliding window that is better than the standard plastic catch. SWMBO needed a new rotary clothes line so I was dispatched to the supermarket & bought it. Now the old one has aluminum arms and I found that by removing the plastic end cap I could cut off the excess refit the end cap so it sits nicely in the sliding window frame, preventing the window opening even when the plastic catch is unlocked. I screwed a spring clip to the bulkhead of the gas locker (avoiding any plumbing on the gas side) so when not required it lives there nice and tidy. I do have 3 spare arms left, so if any Hymer Funsters want 1 pm me and you are welcome to have one all I ask is for the postage cost covered. See the photos attach.