Not sure if this should be in "Ergonomics" or here, and will be of interest to a limited number of people I guess.
I've just had my huge double action contra bass modified with fittings for a neck strap.
The idea is to enable me to play it standing up.
Dave Elliott has put two small lugs (inset into the instrument body) round the two uppermost end screws on each side.
Very solid job, works very well and enables me to play with bands who are standing up or moving about.
An interesting side effect is that I bounce around when playing it - not my usual style!
Picture shows rings through the lugs for attaching straps.
As usual, very nice work from Dave.