In or around the 1970's James Gibbons supplied the floor springs used in the buildings Halls.
In 2019, I have been contacted by Dr Chris Bloore to help with the source and supply of a strap insert for the broken one as can be seen in the picture below.
https://en.wikipedia.org/wiki/Knox_Church,_Dunedin
https://www.facebook.com/KnoxChurchDunedin/