You just take the straps off first with a wrench and then you should be able to treat it like getting off the handel off of any other pole. Put into some hot water and then have 2 people twice in opposite direction to get it loose. Then use something like a dremel tool. fine hacksaw, pipe cutter and then round all the edges and put the grips back on using hot water again.
Business in the front and party in the back is what i live by.