Cheap, yellow zip ties. Learned this shop practice working at Fossman Racing (one of the few Canadians racing in Trans Am in the mid ‘70’s in a GM Camaro, Peter Wiseman). The guy that did most of the work on the cars always insisted we flag any job that was not 100% complete, including torquing all the fasteners and safety wire! There were three mechanics on the car (I mostly cleaned tools, the floor, trailer etc.) and they all did it.
When my two sons started working on my race car, we did the same. Even today, I chuckle when I walk through Chris’ home shop and spot a few hanging on his latest project! The rear pads are missing from my grandson’s RM85. Spot the ties?