The Skerton is horribly outdated at this point. Please replace it with a newer and better entry level hand grinder like the Timemore C3 or a Kingrinder K0 which are both $80 or less or the Kingrider P1 which is around $35. All are far better than the Skerton.
What takes 2 to 3 minutes to grind with the Skerton, takes less than 1 minute with the above.