My tractor has several R-clips, like this one:
These are used in various places. The problem is that they tend to get knocked off by branches or longer grass / brush and get lost.
I've tried orienting them both ways (or multiple ways if the pin they attach to can rotate) but to no apparent benefit.
Is there some other kind of clip or pin which would be available in a similar range of sizes (varied... but all are 2" / 5 cm or less, roughly) but be more resistant to coming off?
I've looked around my local hardware store and the options don't obviously seem any better. They have something like this:
which seems to me just as likely to have the same problem.
As a backup I may replace some of them with bolts, but obviously this sacrifices the convenience of adjustment that these removable clips are meant to provide.