Adjustable Glass Holders

After several hundred hours printing on my replica Ultimaker glass plate it started to chip off and I purchased the original from here https://ultimate3dprintingstore.com/products/ultimaker-glass-plate
The glass arrived in just 2 days, was very well packaged and unlike the clone had straight angles and rectangular shape. The problem, however was that this original glass is about 1 mm wider and longer than the one I used before. Rather than printing another sent of glass holders for this particular glass, I decided to make them adjustable.

NOTE: This design won't work with the original K8400 glass and, as mentioned in comments of the original post, Ultimaker glass does not fit K8400 unless you upgrade it to CoreXY and relocate motors (see my other posts).

All parts are mounted with M3 screws and M3 self-locking nuts with washers. Front corners are fixed. Side pieces move along X, rear pieces move along Y.