So, if you want to replace the red felt, this is how to do it correctly. Of course, if it is necessary for proper adjustment in a restoration, I may turn this screw, but I have the proper gauges and service manuals to make the adjustment properly. If the screw is loosened, this clearance will be lost and it is very difficult to re-establish. This screw holds the thread clearance adjustment. In short, do NOT attempt to disassemble the assembly further or disturb this screw. I will refer to this as “THE SCREW THAT SHALL NOT BE TURNED”. But before we get into that, look at the screw in the center of the mechanism. Because many machines I see do not have it, I will show you how it is replaced. The purpose of this felt is to oil the top and the bottom of the hook race. First, notice the small piece of red felt, it is at the 11 o’clock position above the small round button tab, This is often removed in error or worn away. Lets look closer at the mechanism… There are two things I want to discuss. If you look at the picture above, you will see the thread clearance mechanism. Because this is a normal part of the restoration on our model 66’s and 99’s, I am taking excerpts from earlier posts to describe the procedure. Thread clearance is one of them and this tutorial shows you how to replace this felt without losing the thread clearance adjustment. However, there are some critical adjustments that are difficult to re-establish if disturbed and can degrade sewing performance if lost. This allows them to maintain their sewing performance for generations rather than junk them because they wore out in a few years. One huge advantage of owning a vintage machine is that they are made to be adjusted. I have seen posts on this topic that tampers with the thread clearance mechanism and while accomplishing the task, disturbs a critical adjustment in the mechanism that is difficult to re-establish. This post is intended to clarify the procedure for replacing the small red felt found in the bobbin case of a Singer model 66 or model 99 sewing machine.
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