I have a custom GSH 108 2M (3/8-3/4oz, 9ft) casting rod that I would like to trim down slightly from the tip to make it 1/2-1 1/2oz (like the GSH 102 2MH, 8ft6in). Can this be done? how much should I remove from the tip? 6" difference is alot. What do you suggest? Thanks in advance.