Regular readers will recall that back in early 2020 my Pentax K50 DSLR developed the dreaded “aperture block” fault and that I repaired it by replacing the faulty electromagnet with one purchased on eBay. Readers may also recall that sadly this was a short lived repair and that the problem returned a little over a year later. Investigating the issue online, I came across this extremely useful post. The first half explains how to replace the magnet, which I already