A few things to say in addition to the link is that you may want to recess the nut to avoid hurting others and drill some holes in the pipe to reduce weight.
As shown in the link most people use ski poles, although a golf shaft can be a good light alternative, if a bit hard to drill at times.
I think there are certain types of golf club you should avoid if using it for a mallet. IMO you are better off going with 7075 aluminium ski poles.
http://www.hardcourtbikepolo.com/?page_id=6
A few things to say in addition to the link is that you may want to recess the nut to avoid hurting others and drill some holes in the pipe to reduce weight.
As shown in the link most people use ski poles, although a golf shaft can be a good light alternative, if a bit hard to drill at times.
I think there are certain types of golf club you should avoid if using it for a mallet. IMO you are better off going with 7075 aluminium ski poles.
Also, nike polo?