I saw many different types of gust locks and I have a few. I took the positives from each and worked out the negatives. This is a aileron gust lock that slides between the aileron and wing tip. The angles and the pivot points are different so it fits one way. You can rotate it 180* to work on the other wing. I found that one is more than enough for normal use, longer term aka airshows or long periods outside I use 2.

You can use a simple bungie cord, to secure it to the wing or use one of the catches at https://makerworld.com/en/models/413841#profileId-315884 or https://makerworld.com/en/models/413846#profileId-315887