Here are some pictures of partially dissembled Belplasca recently listed on eBay. It may be helpful to anybody trying to work on the shutter. I was able to lubricate the shutter without much disassembly. I removed the top for the viewfinder cleaning (thanks Jack!) and applied few tiny drops of oil with a syringe and needle through the hole over the shutter mechanism. It made the slow speeds working again. I can't wait to see your hot shoe project as well!