A home owner from USA says:
April 7, 2016
Need help to identify part to order
Tom from SWISCO responded:
April 8, 2016
It looks like you have two different balances. Did these come out of the same window? If so, did they work well, or did you find it was a little off-kilter?
Either way, the key difference is that one balance has "wings" on its nylon attachments, while the other balance does not. Let me know if you need more clarification.
For the balance that does have "wings," see our Series 380 or Series 385. You could have either one of these, depending on the size of the shoe.
For the balance that does not have "wings," see our Series 351 or Series 390. Again, these are the same except the size of the shoe.