Measurement of the recess for the rebound valve

Wanted measurement is marked red. If you can measure it directly, fine. Otherwise you can use the method below.

Measure valve - here: 15,05 mm.
Mount the valve and circlip Pull the valve to the circlip Measure the distance from the circlip to the valve (thickness of the circlip) - here: 1,9 mm
Push the valve all the way in Repeat measurement (the play is what we're looking for) - here: 2,25 mm
Calculate total measurement - hier: 15,05+2,25-1,9 = 15,4 mm