I have used the 18-166 to replace the broken ones, however, it seems that the plastic 18-166 was not strong enough. Can I use Aluminum Top Sash Guide, 18-010? or if you have other better ones.
Thanks,
Vince
Paul from SWISCO responded:
August 5, 2014
You might want to consider our 18-064 nylon top guide. The overall wall thickness is much heavier and the holes line up to 18-166. I think either the 18-010 or 18-064 would work for you.