We did a job with Andy Lewis and this is how we set up temporary slacklines without trees. The bolts we used can be bought at https://amzn.to/2VpKaTJ and the chains I used were the cheap 400lb rated ones from my local hardware store. A great starter slackline if you like rachets is https://amzn.to/381F1nz or if you want to have 1" buy this one https://amzn.to/2vb682h
A more permanent slackline can be rigged without trees by building "dead man anchors", where you bury something and wrap a chain or rope around it and that becomes your anchor on either side.
Check out https://www.hownot2.com/ to learn everything you need to know about slacklining and highlining.
Thank you to my patrons for supporting this channel with $1 per epsiode at https://www.patreon.com/howNOTtoHighline
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