Yeah it appears to be a fix for a slipping seat post indeed. The Alter clamp thing tightens properly although you do need to use two Allen keys simultaneously. Maybe he had a drill but no extra key...
two Allen keys simultaneously
Surely just tighten each bolt a little at a time until it's tight enough not to slip, like every threadless stem ever (?)
Not talking about the stem :)
@Lukas started
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Yeah it appears to be a fix for a slipping seat post indeed. The Alter clamp thing tightens properly although you do need to use two Allen keys simultaneously. Maybe he had a drill but no extra key...