I want to change the scope on my bolt action rifle with the two piece Buehler scope mounts. The style is a little unusual and I don't want to scratch the bases by randomly unscrewing everything. The mounts are described as follows: looking forward on the RH side there is a large screw on the rear base. There is a similar large screw on the LH side of the rear mount. There is a small screw on the RH forward base. There are two small screws on the top of the split rings. Any advice would be appreciated. Thanks.