Hi Phil, sorry to hear about your problems!
When I put together my masterclub tracks for my T-80 I left the fenders off to make it easier for painting and construction, but during my T-90 build I used Miniarm resin tracks and glued the fenders on first. I found the Miniarm tracks to be very similar to the masterclub in terms of construction and format (both resin, both "snap" together links). For the T-90 it was tricky but I got it to work in the end by holding the Hull at odd angles and just threading the tracks through.
One option is removing the pins on the link you intend to join together, so they clip together easily, and then just glue them in place with some super glue.
I'm building a T-62 myself soon, I just got the m1972 kit also, but I'll be using the metal Fruil T-72 tacks for this as I was able to pick some up this week when I was in Paris.
The Masterclub tracks are tricky but i'd persevere with them, they do look great and after all you have already spent the money on them. Seems a shame not to use them.