Need one strong 5.5-6mm or 0.24" OD compression spring, 2.36-3" or 60-75mm long.
The space in the bracket in normal state is 55mm long and 6.25mm wide.

Examples:

https://www.mcmaster.com/9657k171

https://www.ebay.com/itm/305mm-Compression-Spring-0-3-2mm-Wire-Mn-Steel-Pressure-Springs-All-Sizes-Long/132980062965?hash=item1ef63abaf5:m:myL0i3fT6cb96_8YjNos7mA
6mm OD, 0.5mm wire

https://www.ebay.com/itm/5-5mm-OD-5mm-Stainless-steel-compression-spring-up-to-1000mm-long/232590836927?hash=item36277e84bf:m:mQUk3xQ1Sg7_Fa-8zrEuO9A
5.5mm OD, 0.5mm wire, 4.4LB/in
