Greg Elmassian Guest 21 Dec 2022 #2 I think that is an eccentric or eccentric crank, not a counterweight or part of a counterweight.
P phils2um Phil S 21 Dec 2022 #3 Looks like the part you need is only available as one of a group of parts. See Nos. 17 and 18 here: Märklin Onlineshop
Looks like the part you need is only available as one of a group of parts. See Nos. 17 and 18 here: Märklin Onlineshop
J John Fedak Registered 24 Dec 2022 #4 Trainli has them as a left and right set of parts. Parts for LGB Forney LGB 20251