H23a1 hole in block what goes there??

[jap_racer1]

i have a car i am working on for a friend and i never work on h series

where the block connects to the TRANNY there is a little square hole cutout right above the block code and you can see inside what goes there????

[EJ6]

its a little rubber piece that suppose to go there

[Barefoot]

its the hole u look into to set the timing.

[Turbodude06]

the clutch and flywheel should be in their my buddys H22 is like that and I can see his clutch, but I think there is supposed to be a rubber peace their.....

[Tech5]

its the hole u look into to set the timing.