Rollyson window model

Great, thanks. Based on these pictures, it appears you have a Series 380 channel balance. This has the 19-005 top and 15-005 bottom, so as long as those match you should be okay. I would also check to confirm that both the 28 4 balance and 28 2 balance have the same nylon ends.

I'm not sure what the top sash guide might be. Is this different than the one you showed me above? If so, we'd have to see a picture of it.

Hello! Thanks for getting back to us. I'll answer your questions one at a time.

• The corner screw holds the top sash guide to the sash, but it also holds the sash frame together. Without it, you frame will start to pull away from the glass. I would definitely keep them where they are.
• The first solution would be to use an "EASY OUT" kit, which you can get from any local hardware store. Alternatively, you can also remove the sash, take off the top sash rail from the glass, and see if you can reach the broken screw thread from the sash. This can be a bit tricky, though. It wouldn't hurt to consult a professional.
• If the screw bent, then I'd wager the composition of the steel used to make it was too soft. You'd probably want a good stainless steel screw. We sell them, as do most hardware stores.
• Someone probably removed the cord from the balance channel, sure. I couldn't for the life of me guess why, though. The cord is made of nylon and it would take decades for it to deteriorate like you describe.

On the third image you show, I can see a glimpse of your bottom balance shoe. However, I do not know the measurement of it. Could you get back to us with that information? As for the top balance shoe, I am unable to get a clear shot of what it looks like because the measuring tape is covering it up quite a bit. Please also send some additional photos of the top shoe as well.

Hey, sorry! I was out earlier this week and I don't think Paul was fully caught up with our correspondence. Let me go over your questions one at a time, like I did before.

• It's not too  odd that your windows open normally but struggle to close. This happens sometimes with newer balances, whose springs can be a little stiff simply because they've never been used before. Give it some time and see if it persists.
• I would try reinstalling the balance that's poking its head out and see if that helps. If not, try to spray the track with silicone to lubricate it. That might help the balance get back in line like the others. 
• This part is known as a take out clip. You definitely want to replace that one that's all bent up. See our 16-002 .
• Based on your photos, this balance looks like our S380-29 , just like before.

Hopefully that clears up any confusion. Please let me know if you need anything else!

You could use WD-40, but we find that it attracts a lot of dust and debris, which end up gumming up the works, so to speak. Silicone spray works just as well in this instance and is a lot cleaner. The balance springs themselves come pre-lubricated, but if ever you wanted to lubricate them in the future I would use white grease.

Our take out clips should be the same style as yours, I think yours are just bent out of shape a bit.

Finally, yes: a 28 2 stamp corresponds to our 2820 option. That's generally the rule of thumb for these kind of stamps, but if you wanted to be 100% positive, you can always weigh your sash to confirm. I don't think it's necessary, though.