They are for retaining the cams within the spindle nose. Certainly shouldn't be loose. Unless your system is unconventional or not original, I suspect there should be a spring and a pin behind them that mate with a groove in the cam. It may only be the spring force that is preventing them from coming completely undone.

On my Bantam (and in the spec) the bolt is a cheese headed thing that bottoms out hard against a counterbored shoulder, so I'm not convinced your grub screws(?) are original or correct.

Perhaps a Boxford owner could confirm.

Here's a link to the spec for the Camlock system **LINK** showing you how it works and the recommended components. See 33.5.2 and 3.5.3 for the bolt and pin. No spring is shown unless I've missed something.

Murray

Hi,

my early 1980's is11.30 is built in a similar way to yours, just like in your photos. The screws are not loose.

you might consider to telephone Boxford and ask them.

steve