On 13/06/2020 12:40, Chris Hogg wrote:

Lee.
Forget the vine eyes - much too lightweight. The magnodur one looks
better, but I'd go for something like one of these
https://tinyurl.com/yccnmxde or https://tinyurl.com/yc5kbq9d and
screwed into a joist with coach bolts. More expensive, but more
secure. A few exploratory drill holes should locate the edges of the
joist, easily filled/painted afterwards, and pilot holes for the coach
bolts will help ensure they don't split the timber.


Although the latter fixing is rated at 100Kg (approx 15.5 stone) what is
the maximum dynamic load of someone jumping into the chair? With 2 bolts
to fix it without spreading the load could a single joist support the
load, especially if fitted a large distance from where the joist is
fixed to the wall?

The first fixing probably needs an area greater than the width of a
single joist for fixing and it isn't wide enough to fix to two joists


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