ἐμβολ-εύς · embol-eus — LSJ
anything put in: piston, Hero Spir. 1.28, cf. Hsch. s.v. κίουρος; peg, Anthem. pp. 151, 152 W.; dibble or stick for setting plants, AP 6.21.6.
model (usu. wooden) for metal fittings or stone-work, Ph. Bel. 70.13, Hero Bel. 96.5.