I will post this on the wagon thread because I suspect that most of what I might cast will be wagon related starting with some NER No2 Axleboxes and springs I made some masters by modifying some Slaters Midland Railway Axleboxes and attaching MR springs to them (they cone as independent mouldings. Next comes creating the mould. Since I wasn't expecting to show this I took the photos in reverse order. Stick your masters to a sheet of glass using a small dot of superglue to hold them in place while you pour the resin. You will note that there are only three this is because the 4th one came adrift as I removed the mould from the glass.- this was taken after the event. Then build a box around the masters to contain the mould compound. Some people build the box from sheets of plasticard but old lego is the easiest. This is the stuff that I am using to make the mould. Bought from eBay a couple of years ago. There are lots of options to choose from but I was advised by Kerry to get one that you weighed out 50:50 as being the simplest to work with. Weigh it out in a suitable disposable pot. I used the top from a tub of cotton buds that was handy in the workshop and for this particular mould I mixed up 30 grams of each part. As you are mixing try to minimise the amount of ar bubbles but do ensure that you give it a decent mix - I named this my comedy resin casting because for a while I thought I hadn't mixed it enough for it to go off but id did eventually.