Hi all! While I was replacing new capstan rings on my DD9 this little thing came loss under the left capstan. I could not figure out have to put i back so after many efforts i finished the job without putting this part back. Now the WM works anyway fantastic but I still worry the consequenses the loss off this part can cause in the future. Any help would be great. What is the function of this part? Is it neccesary to put it back in place?