I have had the L’s, L2’s, Cam Pro, K’s. In my opinion the L2’s were the best. When doing the surrounds I used a CD with a 30 hz frequency which plays for 3 minutes. You can spread the glue and let it get tacky then turn on the CD and start to adhere the surround to the frame. It will rattle if it’s off center. You can just push it around to eliminate the rattling.
Good job restoring these. They look to be in very good condition. Worth the money to upgrade.