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A great way to trim the zip ties is to use a large pair of toenail clippers. Press the clipper tight and snip. This greatly cuts down on the hard, square edges that can cut or scrape. You have posted some great ideas here, but the trail marker idea... Please try something that won't last as long (if you forget to take them down or if you return on a different route). Instead, use your GPS or piece of yarn.
Bluetooth Speaker Hack - Home Theater Streaming