Lens holder for 40 mm lens in 60 mm optical cage

This is an adapter for non-standard lenses 40 mm in diameter, to mount in Thorlabs 60-mm optical cage.
Consists of two parts:

• adapter body
• spring retainter for lens holding

The spring retainer is mounted onto adapter with 4 screws (3x12 mm).
Additional 4 screws should be on sides (2 on each) to fix the adapter position on the rail.
Springs can be clipped if they are too long (thick lens).