Round bucket with a handle, so I can twirl it around every so often. The Internet stuff I read recommended a 2:1 vinegar/water mix. Naw! I'm using pure white vinegar. I doubt it'll remove all of that bad stain, but it's worth a try. That stain reminds me of some copper pipe that had iron gas pipe touching it -- not only changed the color, but it weakened the copper!
The OTA tube is aluminum. It's 2mm thick (I forget what gauge that's called) -- about the same as what I used on the Jaegers RFT. But unlike the Jaegers, it has a well-disguished seam. I'll be extra careful working around it. No dents! But I guess this puts the scope in the late 40s - early 50's timeframe.
As usual, the things I think will be easy... The tiny brass screws holding the nameplate on didn't want to budge; and, I didn't want to scratch it. Took 20 mins & drops of oil to get those 4 out. Probably untouched for about 70 years.
Edited by Bomber Bob, 26 March 2015 - 11:43 AM.