Hi guys, As a continuation of chasing an oil pressure issue i dropped the sump, changed the gauze and pump and was inspecting the bottom end and came across something i am not sure what it is? The centre main has a "tang" like thing each side of the cap and they have quite a bit of movement in them (as far as the recess in the cap lets them move anyway). I assume these are normal but is being able to move them normal or does it point to a possible shell issue and loss of pressure that way? I dont want to just undo the cap as the bolts are Â£9 each! Also, if i was to replace this, can you do both upper and lower shells without removing the crank? Ie. insert the upper and spin it into place? Thanks, Neil.