DICKSONS QUICK CHANGE LATHE TOOL POST NEEDS A CLEAN AND OIL & LOCKING PIN?

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DICKSONS QUICK CHANGE LATHE TOOL POST NEEDS A CLEAN AND OIL & LOCKING PIN?
THE BLOCK AS BEEN LEFT IN A DAMP ROOM HENCE THE RUST BUT I DONT THINK IT AS BEEN USED MUCH . IT'S IN FULL WORKING ORDER JUST NEEDS CLEANING OF RUST AND SOME OIL.
I THINK THERE IS A LOCKING PIN MISSING SEE LAST PHOTO
APPROXIMATE SIZE OF BASE 65X63.5mm THE BLOCK IS 57X57mm
I AM NO EXPERT ON WATCHMAKERS TOOLS ETC BUT I WILL TRY MY BEST TO ANSWER ANY QUESTIONS.
 PLEASE SUPERSIZE THE PHOTOS SO YOU CAN GAUGE FOR YOURSELF THE CONDITION.