My 4/4 mog is 25 years old and 4k miles.. The rear brakes have ceased while standing and I wish to remove the wires to attend to the brakes. Have applied penetrating oil for a few weeks now but I am unable to remove any wheels with the standard 70mm ring spanner. There is little room to swing a hammer due to the wheel arch and I want to avoid damage. If the spanner is to be extended then it will also require an offset. Any suggestions please for a modest priced solution?