Since the usage of bells are banned after the Gloria in excelsis of the Mass of the Lord's Supper until the Gloria in excelsis of the Easter Vigil, the clapper may be used for the:
Eucharistic Prayer of Holy Thursday
The Transfer of the Sacrament
Although nothing is stated in the Missal as a replacement for the bell on these silent days, the crolatus (or as we call it in the Philippines, -- Matraca) is optionally used.
Majority of the parishes here in the Philippines use the matraca.