Just a suggestion, but if you are interested in a Hummel or a Teenie Two you might take a look at the Thatcher CX4. Easy enough to build, similar to a Teenie , but I think is nicer to fly.
DO NOT put the weights in a freezer or any where else that may cause water to be present in the holes. This is unnecessary and if any water, such as frozen condensation, remains in the hole it will immediately boil off violently and spray molten lead everywhere.
Marty
This is my first post so I hope I get it right and that it helps you.
The transversely mounted muffler on my Rans S7 has three springs each side and the loops that hold them vary in distance from 70 mm to 90 mm apart.
They have been there for 20 years without any problems.
Dean