Hi
Can I just make an observation?. I note the Bolt is entered from the bottom and the nut to the top,? That does not affect the function. However in practice, should the fastener loosen and the nut be lost, the bolt will drop out, the perceived wisdom in all vertical fasteners was to enter the bolt from the top, the nut will likely cause less problems than a bolt if it drops off. The bolt could potentially jamb some other part in a lower situation. As apprentices we would get our wrists soundly slapped!!π (usually a "clip round the lughole"). Some of "our" Bolts where 3ft or more long and 3"+ in dia!!.
Pedantry (still) rules OK!!
Pete