This is a crash flip fin that you weave through the top plate to get it mounted. It does not require any additional hardware, is very durable, long enough to turtle-mode in short and medium length grass, weighs around 6 grams and makes a convenient handle to carry the quad.
I borrowed the idea of "stitching" the fin through the top plate from JTFPV Floss 3.0 turtle mode fin. MASSIVE kudos to JTFPV for the inspiration!
If you print one, please consider posting a make. I enjoy seeing things I designed out in the wild.
Check out other Hyperlite Floss 3.0 accessories I made:
Print as oriented in the file. I recommend using pliers to pull the fin through the outer slits in the top plate since the fit is intentionally tight.