[Corey, Greg]

Had another late start today as we had to give up our crane till late morning (If we had the crane to ourselves, I'm sure we could have easily finished installing HEPIs today).

NW Location

Today, we pulled out the NW aLIGO HEPI (S/N 51) and swapped it with one which had a correctly-positioned HEPI Foot.  As with the SE, this one dropped in nicely and required no horizontal positioning of the Housing (preserving the HEPI Foot range).  As for vertical position, we went with a 0.25" Shim & had to drop the HEPI Foot slightly to accomodate.

Note:  This one is missing a "Right" Housing Clamp.  We have one ready to go and will install it tomorrow.

SW Location

Here we had a iLIGO Actuation Stack in place.  This was removed and staged for "trash/recycling".  The iLIGO Adapter Plate was traced on the Pier.  But for the Drill Template, instead of lining up to the Adapter Plate mark, we set the Template to the (4)-corner Holes on top of the Pier.  Greg then drilled and tapped the holes.  I gathered up clamping hardware.

This HEPI (which will be S/N 77) will be installed in the morning to minimal fanfare.