I bought a Seth Thomas Umbria wall clock this weekend. The suspension spring was broken. A friend gave me one for a No. 2 ST and he said he thought it was correct for the Umbria. Problem is, the brass slot that would accept the suspension spring is too narrow for the new spring I have. Do I simply slide a screw driver up into the slot and widen it? Seems to be the correct thing to do, I just don't want to mess anything up.