Light Meter Repair

I have an old Sekonic Flashmate L3088 light meter which lost its incident
light metering hemisphere, or at least most of it. The slider is still
there.

I bought a new slider / hemisphere (about $40CDN) and am trying to figure
out how to get the old slider off so that I can put the new one on.

There doesn't seem to be any screws to remove, and nothing seems to pop or
slide off. Any ideas how to make this repair short of taking it in to
repair shop?

Thanks for the info.

Take Care,
Dudley