Zenith 29JC20 21"--cataract and convergence

[Techguy46]

Re "a bolt and wing nut" on the cloverleaf--or any metal patching for that matter--I would worry that this would disturb the fields from the convergence coils. Would patching a cloverleaf with say, small bits of brass or aluminum mess up the convergence?? Anyone try it? Just askin'....