Just reminded me reading tigertiger's post... when needs must, I'm not above making my own tools to suit a specific purpose. Here's a selection!
Impromptu saw! I needed to cut away some unwanted old plasticard inside the narrow Cossack hull (with nowhere at all for a large saw handle to go never mind a couple of fingers!) so, a broken piece of hacksaw blade and a suitable lump of unused milliput from the freezer moulded to suit the contours of your fingers... does a fantastic job too, without chewing your fingers up! :)
Useful sanding block... Think I've said this before, but don't throw your bits of wet n' dry away! A small piece superglued to some balsa means I can get some difficult to reach areas sanded without too much hassle... I have a few of these in all sizes and grades!

Comfy blade! Again, for those areas where you can't get the whole Stanley knife into, but using the blade causes you grief. This one I've had for a few years - packed around with some polystyrene and foam and a strip or two of packing tape to secure....

Cheers, Brian
[Too Large - attachment deleted by admin]