Remove your BSA fork seal holders the correct way using this factory style spanner service tool. There are a couple ways to remove your fork seal holders but there is only 1 correct way... using this tool

Made to replace part number 61-3005. Features 2 tabs on the bottom to slip into your fork seal holder slots - hollow on the inside to slide over your fork stanchion tube. Works with many BSA pre-unit and unit construction models from the A7, A10, A50, A65, B31, B33, M20, etc up to approx 1968. Please refer to your parts catalog for proper fitment.