Broken Toolbox part

I have no idea how I did this since the toolbox files areread only, but somehow I broke my dowel pin. It no longer brings inan actual part, just the sketch. I have tried to go into the "part"and add the necessary revolve and it tells me that it is a readonly file and I can't over write it.

Does anyone know what I might have done so I don't do it again inthe future?

Can anyone help me fix it?

I don't have this problem with any other parts.

thanks!SolidworksToolbox