I picked up this wall clock at a flea market as something to play with... I found that the hair spring has been damaged... Three questions really... First, I assume that I cannot simply clip it shorter and be able to get it to run. That seems like it may work but that it would go too fast... Second, would a collection of "clock hairsprings" such as this... Clock Hairspring Assortment - Clockworks, be likely to include a suitable replacement? and Thirdly, is the collet on these a simple press-on fit? The existing one seems quite firm on the arbor. Thanks.