G62 carb insulator block 101..Shiny black, Horizon aftermarket...
Dull black, stock Red Max chainsaw, used also on the G62 airplane engine...Some kind of plastic material, not strong enough for good threads...
Bakelite is molded from layers of linen, is brown....That's why the Horizon tan block cracks...
The bakelite brown block is too weak to be tapped without something else in the hole, there are inserts in the block...Shiny black block has no inserts, threads are in the block..Dull black block has no threads in it, the carb bolts go all the way through to the cylinder...