Thanks Tim, great info!
I probably jumped the gun a bit too soon, but this one on eBay looked good to me so I purchased it. I probably paid to much, but I'd rather have this than what I have now or some other chi-com bloc repop.
http://item.mobileweb.ebay.com/viewitem?itemId=190494109249I talked to my grandpa today, apparently he still has the original horn in his barn. Said it was not working right, hopefully I can find it and get it fixed/ restored. It may just have needed adjusting.
Lee