Recently I exposed our staircase by taking down the boarding surrounding it with the intention of putting on a banister/spindles etc. It is a closed string staircase and, although supported at both ends, the strings have since started to move apart slightly so that now a few of the treads/risers have come loose and fallen through. I have made emergency repairs to support the treads but cannot find a way to bring the strings back together to allow them to be fixed in place - however much banging and swearing. One string is against the wall so that rules out sash cramps but is there any iron mongery on the market that I can fix under the treads and between the strings to stop any more movement/bring it all back together? Help needed asap befor our plumber falls through them again!
Cheers
Cheers