If the staff was solid, you could thread the ends, and put a pair of locknuts on each end.
NN|WWW|NN=======
This would be at each end, where:
N=Nut
|=Washer
W=Wick
= is the handle.
Hardest part with this one is threading the bar long enough to do put wicks on. Though, if you just got threaded bar, and put a handle on it, then you shouldn't have to worry.
If hollow, you could still do something similar, i guess, but it would be rather tricky without some tools/equipment, like a welder.
NN|W_W_W_W_W_|*-----
NN|_____________|
NN|WWWWWWWW|*-----
(Just pretend that the W_W_ is an underlined line of W's)
Much the same, but this time:
W= wick
_= threaded bar
*= Weld
| = washer
-- = handle
Or, in words, you put the threaded bar into the hollow pipe, and weld it there, then use it like a bolt.
If you wanted to be really tricky, you could thread the inside of the pipe, and the rod, and screw them together.
For these, i'd recommend using two nuts, so they lock together.
I'll draw them up and scan them if that'd make it easier to understand?
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