What are these screw holes for?

[godavid2]

I have a 2005 anniversary headstock with two screw holes just above the vent plate. I don't know their purpose. I believe this hs came off a 520. Thanks in advance for any help here. The screw holes look to be a part of the hs casting. I'm clueless here. Thanks again. I have added a picture.

[damagi]

There is a plastic guard that can be installed there to prevent you from grabbing the hub while its spinning. It comes standard on the powerpro headstocks for example.

[dusty]

I think that the guard was originated so as to qualify the headstocks for sale in Europe. I understand that it is required to meet saftey requirements. The guard has been around for quite awhile.

[damagi]

http://www.shopsmith.com/ss_forum/viewt ... 20#p184520

Look at the second photo, that's the plastic guard. As dusty notes, European regulations are the reason from what I understand as well.

[godavid2]

Thanks, guys.