I snapped one of the bolts holding the pan (fortunately not the powerhead). It's a good chance to clean everything up and grease bits you can't normally get to.

http://www.machine7.com/product.php?xProd=652 These are the ones I used for the gearbox. Same material for suspension bushings though. The previous ones had been in for 45 years and they weren't even totally knackered, so hopefully another 20 years out of these ones.