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Just an FYI. I have a pro-vision borescope for sale on E-Bay. This is just thing for looking into the valves and determining the necessary bumpers or hardware needed for correct valve alignment. I bought it for this purpose and it really made a significant difference in performance on my instruments. Money well spent. These things sell for 300 new. Buy it, use it, and re-sell it. Do-it-yourself valve alignment job for a fraction (literally pennies) of other means. Also great for checking for solder and other obstructions inside tubing bore after repair.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 0298364044" target="_blank" target="_blank

Heckofa good price! If I didn't already have a 30" Provision I'd bid!

I bought a Provision model 300 (36 inch) borescope on Ebay for $110 Item number: 320330923245
Both the 100 and 300 are 0.400 inch or 10mm diameter. If I had to buy one again I would not hesitate to buy the more expensive Provision 636. This is also a 36 inch long scope but is higher resolution and most importantly, has a much smaller diameter (0.23 inch. or 6mm) making it fit around tight bends easier. I have had a few problems getting the Provision 300 in close to see piston valve openings lining up to the pipes, even with the optional right angle mirror. I would strongly recomend getting the right angle mirror as well.