Replace pin

A handy person from wife auntie at appartment building says:
December 5, 2023

is the 21-028 door guide pin round or square at top of the spring. i think it needs be square

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Paul from SWISCO responded:
December 6, 2023

Hello,

As long as the square hole measures 1/2", then the 21-028 spring-loaded pin with a 13/32" cap should fit your door and track. Just let us know if you have any other questions and thanks for posting. 
Bifold Door Guide Pin, Peachtree
Bifold Door Guide Pin, Peachtree
21-028
$5.05
Bi-fold Door Repairs
Bi-fold Door Repairs
GUIDE
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