7mm/ft 1:43.5 scale press tool to put the impression of a 4-bolt rectangular chair into a wooden sleeper either by force (hit with a hammer, squash in a vice, spring-loaded centre-punch or mount in a drill-press) or by burning (mount in the end of a soldering iron).
The width of the press tool is a scale 10" so guides can be bolted to either side enabling the tool to be centred within the sleeper.
0.962 w x
0.584 d x
0.379 w x
0.23 d x