The lens is in near-mint condition, but the shutter has been tested as slow at a ll speeds, especially the faster ones like 1/400, which is off by 100%. i've had free tests and estimates done ($35-$45 depending on the repair shop here in nyc ). i'm trying to decide whether to 1.) keep it, have the shutter overhauled, and buy $50 lens boards for them so i can use it in my new (used) toyo 45A, or on t he other hand 2.) just sell it(i've been offered as much as $175 in cash and $2 50 in store credit. so i wonder: 1.is it worth fixing and buying lens boards for? (how good is it as lenses, and what will i lose in the way of performance by not using the best lenses availabl e)? shouldn't i just trade it in towards a Sironar-S 210 with a good shutter? 2. is it fixable so that the shutter is very accurate? 3. is it important to have it professionally mounted on a toyo lens board, or ca n i do it myself?

thank you for your help. mark