<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1463929336615_4202">Hi all,</div><div id="yui_3_16_0_ym19_1_1463929336615_4202" dir="ltr">I am building a rig to rotate my hatch on Elementary 3000 to lap the seat to perfection. I am doing this because I am in need of low cost projects and I want to see if it works for future deeper diving subs. I have little experience with lapping other than lapping valves in antique engines. </div><div id="yui_3_16_0_ym19_1_1463929336615_4202" dir="ltr">Can I just let the hatch float on the compound while it is rotating with the full weight of the hatch bearing down on the seat, or do I need to suspend the hatch while it rotates to control the weight of the hatch on the seat. </div><div id="yui_3_16_0_ym19_1_1463929336615_4202" dir="ltr">I will be re-maching the centre hole of the hatch because the centre hole is no longer dead centre from repeated machining processes. The centre hole will hold a shaft with bearings to keep it rotating true.</div><div id="yui_3_16_0_ym19_1_1463929336615_4202" dir="ltr">Any advice will be helpful.</div><div id="yui_3_16_0_ym19_1_1463929336615_4202" dir="ltr">Hank</div></div></body></html>