[vinceguidry]

Nineteenth century kit wouldn't really be all that difficult to replicate with the materials available in the early middle ages. Even the precision stuff of the time, you can make a surface plate just by scraping an iron sheet. With a surface plate you can make everything else you need. The hard part would be higher quality metallurgy, but it's certainly doable, the Chinese were making cast iron as early as 5th century BCE. Even steel was possible with even Bronze Age equipment.