I just tried the version 2.1.0.2 and 2.1.0.1, but no luck.
but since its working for others i guess it has to do with me.
this is what i do:
1. download the mod.
2. put the compressed zip in mods folder of the tekkit server and my clients tekkitmain mod folder.
3. start the server and the game
4. make sure the mod is in the modlist
5. connect and try to craft a carriage crosspice
but none on the above versions, nor the latest work for me. But the server gets a dependency and kicks everyone that does not have the mod.
if you need any logs or anything just tell me.
I wish this would get included in the standard build =)