About this 3D model

The red printed part replaces the worn through original bump head on a Homelite trimmer/ weed whacker. I've had the trimmer machine 15 years, it still runs well. I replaced the whole head a few years back, now the bump head itself has worn through again completely as you can see in the black plastic part photo. The bolt recess needed a little re-sizing after my first attempt. Made the design solid because I could!. The injection molded original would have had issues cooling out of the tool if it were solid, also it wouldn't have worn out so quick.