I'm in sandbox and I want to get omega kerfur but I cant dig to get the radioactive capsule  I've tried changing my binds and everything trying to get the shovel to work and it's not just the spot for the capsule it doesn't work anywhere and I can't find the capsule in the spawn menu 

press right click 

tried I have that as attack and left as use so when I do it just bangs the floor

I found it I have it as the (M) key 

bro is playing like a doom player in 1993

I have that as my rotate because I don't use it that often 

if you only need omega kurfur, then I can suggest this option:

in the spawn menu there are parts of omega kerfour (2 arms, 2 legs, torso, head) with the help of them you can assemble omega kerfour

p.s. I'm sorry I don't know how to solve the shovel problem