I am looking at some new gaffs to replace my bell pole spikes. I am looking at the buckingham gaffs but see some differences between the diferent models. The replacible ones are 2 1/2 inches, the solid ones are 3 1/2 inches. I like the longer ones but they are not replacible. Will they eventually ware out? Can i get 3 1/2 inch spikes for the replacible gaffs? Are bird toe spikes better? I need to get some soon before I kill myself with the 1 1/2 inch spikes I have now. Thanks