Something like these might work.....
http://www.tooled-up.com/Product.asp?PID=170849&Referrer=froogle
What size is the pipe?
Edit.
Just seen heatingmans "expanding" rawlbolts post.
What a cracking idea.
http://www.tooled-up.com/Product.asp?PID=170849&Referrer=froogle
What size is the pipe?
Edit.
Just seen heatingmans "expanding" rawlbolts post.
What a cracking idea.