Nancy,
The retainer spring on Joe's 500 is the same on the Singer 401, 403, and 503.
Here's a close up picture of the spring.
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Originally Posted by
BoJangles
Thank you Joe, and thanks for the quiz! I had set my 503a on the computer table so I could compare my machine to your photo! I could not tell by looking at your photo what the problem was! Luckily I have a 503a, 2-401a's, and a 500a - but, none of them have ever had a problem with the horizontal rotary hook/bobbin assembly area! Now, if I get a horizontal rotary hook machine I will know what to look for if I do get one with issues! Nancy