Yokomo Rear Bulkhead ID Inquiry

[Toaster]

With all kinds of parts getting mixed and matched over the years I was hoping someone might be able to help point me in the right direction on something.

This rear diff case / bulkhead was mounted on an old 870 I acquired years ago. I have this funny feeling it may have been from a YR4 series car but what is tripping me up is the hole…something I also could have sworn seeing something similar on one of Masami’s Cars but can’t find any pictures of which one it was?

Any help on identifying what vehicle this originally came from and what Masami YZ10 has this similar screw/hole would be super appreciated.

[Subboy]

The ‘93 WCS had this out of the box but it was a common modification that people did back in the day, especially if you were running the M2 fine pitch belts.

[Dr XX]

I think the hole is to add a device to stop the fine pitch belts from skipping.

[Dr XX]

Here's a picture.

WCS Belt Tensioner.JPG (11.55 KiB) Viewed 487 times

WCS Belt Tensioner.JPG (11.55 KiB) Viewed 487 times