I started work on the already taped off worm screw from the garage door opener. I used a dremel with a cutting wheel to cut a line down the middle and then remove the remaining material at an angle to produce the teeth of the rasp. In the first pic you can see the teeth making process has began.
The teeth are now formed and have been cleaned up with a file. Next I will cut the ends off.
In the next pic you can see the ends have been cut off. The narrower of the 2 will be used as an end piece later. The grey 'insert, female adapter 1/2' has had the larger end sanded down some so that it will fit into the end of the 'backflow prevention valve' which has also had the threads on the female end sanded down to also aid in the fitting.
Next is the brass tube that will extend off the rasp. I cut it to be 1 1/3 the length of the rasp as it appeared to be in the reference photos. The end piece removed from the rasp has been glued on the tube and epoxy putty has been applied as per the photo of the worm hob. It will be the end of the week before I can do any more work on this.
