fig3 groove 114 a may be created in any manner to house seal 250 a similar to fig2 fig4 a and 4b are cross sectional schematics and seals 250 a extend in non illustrated depth directions potentially to form an annular ring or section with a c shaped cross section example seal 250 a may be sized to fit in groove 114 a with a small vertical protrusion to allow for compression and sealing across distance d when shroud 114 is vertically seated against a lower structure such as core plate 118 in example system 200 fig2 because groove 114 a may be in a downward facing vertical orientation and example spring 250 a may be installed in groove 114 a against the force of gravity retaining clip 415 may be used to hold example spring in groove 114 a when not compressed for example retaining clip 415 may adjoin in a gap of a c shaped example seal 250 a fig4 a or may join to or push against a curvature of a c shaped example seal 250 a fig4 b through frictional contact welding bolting or other joining and retaining mechanisms bolt 410 may secure retaining clip 415 to the upper structure such as shroud 114 bolt.