Pivot shoe replacement

A home owner from Woodstock, ON, Canada says:

Old double hung vinyl windows. Canadian? window manufacturer unknown.

Pivot shoe dimensions: 2 1/8"h x 1 1/4"w x 9/16" (17/32"?)d

Track dimension: 1 3/8"w x 9/16"d

Has curved metal hook for attaching twist spring.

Your part 15-118 or 15-121 as replacement? Your recommendation appreciated. Will need to replace 16 pivot shoes as the plastic is cracking on all windows and breaking apart. Thanks. Andy

Thumbnail of the uploaded file named 20190325_190624.jpg
Profile picture of Tom
Tom from SWISCO responded:

Both the 15-121 and 15-118 are the same size, according to their manufacturers, but according to my micrometer it's more precisely .580" thick. The 15-121 is .590" thick. I believe this is because the brake pad on the 15-121 gives it just that hair extra thickness. You may want to get a more precise measuring implement to confirm the better match if you think that .010" is going to be a big factor. Between you and me, it may not be.

Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)