Tailstock Question

[MWF FEED]

I am refurbishing a tailstock from a metal work lathe to use it on a wood turning lathe. There is a blind hole in the top of the casting near the barrel clamp, does anyone know what is its purpose? The hole is approximately 10mm in diameter and 16 mm deep, it does not have a thread. Picture 2 is an overall view and the hole in question is the one on the right in the first picture. Thanks for any assistance.
Mm.DSC06314.jpg (https://metalworkforums.com/attachment.php?attachmentid=384316&d=1579340117)DSC06219.jpg (https://metalworkforums.com/attachment.php?attachmentid=384315&d=1579340045)
Attached Images

https://metalworkforums.com/images/attach/jpg.gif DSC06314.jpg (https://metalworkforums.com/attachment.php?attachmentid=384316&d=1579340117) (130.4 KB)
https://metalworkforums.com/images/attach/jpg.gif DSC06219.jpg (https://metalworkforums.com/attachment.php?attachmentid=384315&d=1579340045) (106.8 KB)




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