@komet163b - I just ordered another set of 10 off eBay for my Texas "shop" - should have them by early December. Then I'll send you two 100mm lengths of glass tube, via USPS. That should be enough for 7~9 engines. I just ask that you cover shipping (once I know it). Never know, you might end up with a part I'll needing and you'll think of me :-)
I'll keep you posted!