Originally Posted by
sseaman
If it is ABS plastic, which it probably is, you can buy a can of ABS cement/solvent from the hardware store in the plubing section, and it can melt the pieces together. This works great on many things around the house.
It's not ABS- ABS is fairly rigid. Bicycle seat bases need to be flexible. I bet it's polyethylene-based, but that's a WAG. Dammit, Jim, I'm a bicycle mechanic, not a chemical engineer!