The cups are STD Trident,I tried a set up with fibre washers but there was too much squash,played about with a few other variations and settled on the set up in the photo,worked a treat.
Most of the TSS`s I have worked on have usually had a fair bit of wear on the rocker spindle shafts,so I replace them with Nourish rocker spindles.
The TSS in the pictures above also suffered from the outer crankcase to barrel stud threads pulling out,which took a lot of work to put right, as well as the usual TSS problems like sunken liners,loose valve guides,crankcase intermediate spindle bush among others.
Some of the later TSS crankcases were strengthned at the outer crankcase to barrel stud holes by welding up the bosses inside and making the threaded hole deeper.
This was also a common problem with the racing guys who fitted the Rickman 8 vavle top end to 650 crankcases.
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I used an Aerco alloy belt drive kit which runs in oil.