About 50% of all Beogram 4002/4004s seem to have decayed transport lock bushings. A while back I developed a 3D printed replacement part that can be inserted without needing to disassemble the chassis. The part is available in my Shapeways store. Here is a picture of a set of three bushings (you will need 6 parts. Two make up one complete bushing (See below for a link to the installation video).
The Beogram 4002 (5513) that I am currently restoring also had this problem. When I took it out of the box, the telltale orange fragments were all over the place. So I replaced the fragmented bushings with my 3D printed replacements. Here are a few pictures of this effort taken while I worked on the lock next to the carriage servo motor.
This shows the orange fragments and the lock before I fixed it:
Here you see the remnants of the original lock as it crumbled out of the mounting hole:
After cleaning all the debris, I inserted the lower bushing part:
Then I added the top part:
And then put the lock screw in place together with the mounting plate:
This procedure needs to be done for all three transport locks. When I designed the part, I also made a short video about installing the bushings:
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